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Lesson Posted on 29/03/2022 Learn Cell – Structure and Functions

Cell - Structure and Functions

Maan Gulati

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Chapter – 8 Cell — Structure and Functions Cell: The smallest structural and functional unit of an organism, which is typically microscopic and consists of cytoplasm and... read more

                                                                     Chapter – 8
                                                   Cell — Structure and Functions

  • Cell: The smallest structural and functional unit of an organism, which is typically microscopic and consists of cytoplasm and a nucleus enclosed in a membrane.
  • All organisms are made of smaller parts called organs.
  • Organs are made of still smaller parts. The smallest living part of an organism is a ‘cell’.
  • Cells were first observed in cork by Robert Hooke in 1665.
  • Cells exhibit variety of shapes and sizes.
  • Number of cells also varies from organism to organism.
  • Some cells are big enough to be seen with the unaided eye. Hen’s egg is an example.
  • Some organisms are single-celled, while others contain large number of cells.
  • The single cell of unicellular organisms performs all the basic functions performed by a variety of cells in multi cellular organisms.
  • The cell has three main parts, (i) the cell membrane, (ii) cytoplasm which contains smaller components called organelles, and (iii) the nucleus.
     
  • Cell membrane: The basic component of a cell. The cytoplasm and nucleus are enclosed within cell membrane. There is an outer thick layer in cells of plants called cell wall.
  • Cytoplasm: The jelly-like substance present between the cell membrane and the nucleus. Various organelles present in the cytoplasm are:
    (i) Mitochondria
    (ii) Plastids (present only in plant cell)
    (iii) Endoplasmic reticulum (ER)
    (iv) Ribosome
    (v) Lysosomes
    (vi) Vacuole
    (vii) Golgi body
    (viii) Centrosome (present only in animal cell).
     
  • Nucleus: Nucleus is separated from cytoplasm by a nuclear membrane. It is generally spherical in the centre of the cell.
  • Nuclear membrane: Nucleus is separated from the cytoplasm by a membrane called the nuclear membrane.
  • Nucleolus: Nucleus contains a still smaller round body known as nucleolus.
  • Chromosomes: Nucleus contains thread-like structures called chromosomes. These carry genes and help in inheritance or transfer of character from the parents to the off springs
  • Cells without well organised nucleus, i.e. lacking nuclear membrane, are called prokaryotic cells.
  • Plant cells differ from animal cells in having an additional layer around the cell membrane termed cell wall.
  • Coloured bodies called plastids are found in the plant cells only. Green plastids containing chlorophyll are called chloroplasts.
  • Plant cell has a big central vacuole unlike a number of small vacuoles in animal cells.
  • Size of cells: The size may be as small as a millionths of a metre or may be as large as a few centimetres. Size of the cells has no relation with the size of the body of the animal or plant. It is related to its function.

 

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Answered on 21 Feb Learn Cell – Structure and Functions

Sadika

Chloroplasts are specialized organelles found only in plant cells and some protists. They are responsible for carrying out photosynthesis, the process by which plants convert light energy into chemical energy in the form of glucose, using carbon dioxide and water. There are several reasons why chloroplasts... read more

Chloroplasts are specialized organelles found only in plant cells and some protists. They are responsible for carrying out photosynthesis, the process by which plants convert light energy into chemical energy in the form of glucose, using carbon dioxide and water. There are several reasons why chloroplasts are found only in plant cells:

  1. Origin: Chloroplasts are believed to have originated from endosymbiotic cyanobacteria that were engulfed by ancestral eukaryotic cells. Through the process of endosymbiosis, these cyanobacteria formed a symbiotic relationship with the host cell, eventually evolving into the chloroplasts found in modern plant cells.

  2. Photosynthesis: Chloroplasts are the primary site of photosynthesis in plants. They contain chlorophyll, a green pigment that captures light energy from the sun and converts it into chemical energy through a series of biochemical reactions. This process enables plants to produce organic molecules such as glucose, which serve as a source of energy and carbon for the plant.

  3. Autotrophic Nature of Plants: Plants are autotrophic organisms, meaning they are capable of producing their own food through photosynthesis. Chloroplasts are essential for this process, as they provide the machinery necessary for capturing light energy and converting it into chemical energy. Since animals and most other organisms are heterotrophic, they do not require chloroplasts for energy production and thus do not possess these organelles.

  4. Cellular Specialization: Plant cells have evolved specialized structures and organelles to perform various functions required for their survival and growth. Chloroplasts are one such specialized organelle found exclusively in plant cells, where they play a crucial role in energy production and carbohydrate synthesis.

Overall, chloroplasts are uniquely adapted organelles found only in plant cells, where they enable plants to carry out photosynthesis and produce their own food. Their presence is essential for the autotrophic nature of plants and their ability to sustain life through the conversion of light energy into chemical energy.

 
 
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Answered on 21 Feb Learn Cell – Structure and Functions

Sadika

The statement "cells are the basic structural and functional unit of life" highlights the fundamental concept in biology that all living organisms are composed of cells and that cells are the smallest structural and functional units capable of exhibiting the properties of life. This concept is known... read more

The statement "cells are the basic structural and functional unit of life" highlights the fundamental concept in biology that all living organisms are composed of cells and that cells are the smallest structural and functional units capable of exhibiting the properties of life. This concept is known as the cell theory and is a cornerstone of modern biology. Here's an explanation of why cells are considered the basic units of life:

  1. Structural Organization: All living organisms, from simple single-celled bacteria to complex multicellular organisms like plants and animals, are composed of one or more cells. Cells are the building blocks of life, and the structural organization of an organism arises from the arrangement and interactions of its constituent cells.

  2. Functional Units: Cells perform all the essential functions necessary for life, including metabolism, growth, reproduction, response to stimuli, and homeostasis. Each cell is capable of carrying out these functions independently, making it a functional unit of life. Even in multicellular organisms, the specialized cells that make up tissues, organs, and organ systems retain the ability to perform specific functions essential for the survival of the organism as a whole.

  3. Genetic Material: Cells contain genetic material, such as DNA (deoxyribonucleic acid), that carries the instructions for the synthesis of proteins and the regulation of cellular processes. DNA serves as the hereditary material passed from one generation to the next and governs the development, growth, and functioning of cells and organisms.

  4. Cell Theory: The cell theory, formulated in the 19th century by scientists such as Matthias Schleiden, Theodor Schwann, and Rudolf Virchow, states that:

    • All living organisms are composed of one or more cells.
    • The cell is the basic structural and functional unit of life.
    • All cells arise from pre-existing cells through the process of cell division.
  5. Unity of Life: The cell theory underscores the unity of life, as all living organisms share a common cellular organization and biochemical basis. Whether an organism is a single-celled bacterium or a complex multicellular organism, its essential functions are carried out by cells.

In summary, cells are considered the basic structural and functional unit of life because they are the smallest entities capable of exhibiting the properties of life, including organization, metabolism, growth, reproduction, response to stimuli, and heredity. The cell theory provides a framework for understanding the fundamental properties of living organisms and their underlying cellular basis.

 
 
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Answered on 21 Feb Learn Cell – Structure and Functions

Sadika

Eukaryotes and prokaryotes are two broad categories of organisms distinguished by the presence or absence of a distinct nucleus and other membrane-bound organelles. Here are the main differences between eukaryotic and prokaryotic cells: Nucleus: Eukaryotes: Eukaryotic cells have a true membrane-bound... read more

Eukaryotes and prokaryotes are two broad categories of organisms distinguished by the presence or absence of a distinct nucleus and other membrane-bound organelles. Here are the main differences between eukaryotic and prokaryotic cells:

  1. Nucleus:

    • Eukaryotes: Eukaryotic cells have a true membrane-bound nucleus that houses the genetic material (DNA) in the form of linear chromosomes. The nucleus is surrounded by a nuclear envelope consisting of two lipid bilayers.
    • Prokaryotes: Prokaryotic cells lack a membrane-bound nucleus. Instead, the genetic material is typically located in a region of the cell called the nucleoid, which is not enclosed by a membrane. The DNA in prokaryotic cells is usually circular and exists as a single, continuous loop.
  2. Membrane-Bound Organelles:

    • Eukaryotes: Eukaryotic cells contain various membrane-bound organelles, such as mitochondria, endoplasmic reticulum, Golgi apparatus, lysosomes, and chloroplasts (in plant cells). These organelles compartmentalize the cell and perform specific functions.
    • Prokaryotes: Prokaryotic cells lack membrane-bound organelles. Instead, they contain specialized structures such as ribosomes, cell walls, and flagella, but these structures are not enclosed within membranes.
  3. Cell Size:

    • Eukaryotes: Eukaryotic cells are generally larger and more complex than prokaryotic cells, with sizes ranging from 10 to 100 micrometers in diameter.
    • Prokaryotes: Prokaryotic cells are smaller and simpler, with sizes typically ranging from 0.1 to 5 micrometers in diameter.
  4. Cytoplasmic Organization:

    • Eukaryotes: The cytoplasm of eukaryotic cells is compartmentalized by membrane-bound organelles, allowing for specialized cellular functions to occur in different regions of the cell.
    • Prokaryotes: The cytoplasm of prokaryotic cells is relatively simple and lacks compartmentalization by membrane-bound organelles. Most of the cell's metabolic processes occur in the cytoplasm.
  5. Cell Division:

    • Eukaryotes: Eukaryotic cells undergo mitosis or meiosis during cell division, which involves the replication and distribution of the genetic material into daughter cells.
    • Prokaryotes: Prokaryotic cells reproduce primarily through binary fission, a process in which the cell divides into two daughter cells, each containing a copy of the original cell's genetic material.
  6. Examples:

    • Eukaryotes: Examples of eukaryotic organisms include plants, animals, fungi, and protists.
    • Prokaryotes: Examples of prokaryotic organisms include bacteria and archaea.

These are some of the main differences between eukaryotic and prokaryotic cells. Despite their differences, both types of cells share fundamental features, such as a plasma membrane, cytoplasm, ribosomes, and genetic material, that are essential for life.

 
 
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Answered on 21 Feb Learn Cell – Structure and Functions

Sadika

Photosynthesis is the biochemical process by which green plants, algae, and some bacteria convert light energy from the sun into chemical energy in the form of glucose and oxygen gas. This process takes place primarily in the chloroplasts of plant cells, specifically in the chlorophyll-containing... read more

Photosynthesis is the biochemical process by which green plants, algae, and some bacteria convert light energy from the sun into chemical energy in the form of glucose and oxygen gas. This process takes place primarily in the chloroplasts of plant cells, specifically in the chlorophyll-containing thylakoid membranes. Here's a simplified explanation of the process of photosynthesis:

  1. Absorption of Light:

    • Photosynthesis begins with the absorption of light energy by chlorophyll molecules located in the chloroplasts of plant cells. Chlorophyll is a pigment that gives plants their green color and is responsible for capturing light energy from the sun.
  2. Light-Dependent Reactions:

    • The absorbed light energy is used to drive a series of biochemical reactions known as the light-dependent reactions, which take place in the thylakoid membranes of the chloroplasts.
    • During these reactions, light energy is used to split water molecules (H2O) into oxygen (O2), protons (H+), and electrons (e-). This process is called photolysis or water oxidation.
    • The electrons released from water molecules are transferred along an electron transport chain (ETC) embedded in the thylakoid membrane. As the electrons move along the ETC, their energy is used to pump protons from the stroma (the fluid-filled space inside the chloroplast) into the thylakoid lumen (interior of the thylakoid).
    • The movement of electrons along the ETC generates a proton gradient across the thylakoid membrane, creating a proton motive force that drives the synthesis of ATP (adenosine triphosphate), a molecule that stores chemical energy.
  3. Generation of ATP and NADPH:

    • As protons flow back across the thylakoid membrane through ATP synthase complexes, ATP is synthesized from ADP (adenosine diphosphate) and inorganic phosphate (Pi). This process is known as chemiosmosis.
    • Meanwhile, the electrons transferred along the ETC are eventually captured by a molecule called NADP+ (nicotinamide adenine dinucleotide phosphate), along with protons, to form NADPH, a molecule that carries high-energy electrons.
  4. Calvin Cycle (Light-Independent Reactions):

    • The ATP and NADPH generated during the light-dependent reactions are used to power the Calvin cycle, also known as the light-independent reactions or the dark reactions.
    • The Calvin cycle takes place in the stroma of the chloroplast and involves a series of enzyme-catalyzed reactions that use carbon dioxide (CO2) from the atmosphere, along with the ATP and NADPH produced during the light-dependent reactions, to synthesize glucose (C6H12O6) and other organic molecules.
    • The key steps of the Calvin cycle include carbon fixation, reduction, regeneration of the CO2 acceptor molecule (RuBP, ribulose bisphosphate), and the synthesis of glucose.
  5. Production of Glucose and Oxygen:

    • Through the combined action of the light-dependent and light-independent reactions, plants are able to convert carbon dioxide and water into glucose and oxygen gas (O2).
    • The glucose produced during photosynthesis serves as a source of energy and carbon for the plant and is used in cellular respiration to generate ATP for cellular processes.
    • The oxygen gas produced as a byproduct of photosynthesis is released into the atmosphere, where it can be used by other organisms for respiration.

In summary, photosynthesis is a complex biochemical process that enables green plants, algae, and some bacteria to convert light energy from the sun into chemical energy in the form of glucose and oxygen gas. This process plays a crucial role in the global carbon cycle, as it is the primary means by which carbon dioxide is removed from the atmosphere and organic carbon is synthesized and stored in living organisms.

 
 
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Answered on 21 Feb Learn Cell – Structure and Functions

Sadika

Cytoplasm is a semi-fluid, gel-like substance found inside cells, enclosed by the cell membrane. It is a key component of all cells, serving various structural, biochemical, and transport functions. Here are some key points about cytoplasm: Composition: Cytoplasm consists of water, ions, small... read more

Cytoplasm is a semi-fluid, gel-like substance found inside cells, enclosed by the cell membrane. It is a key component of all cells, serving various structural, biochemical, and transport functions. Here are some key points about cytoplasm:

  1. Composition: Cytoplasm consists of water, ions, small molecules, proteins, enzymes, organelles, and other cellular structures suspended within the cytosol, the liquid portion of the cytoplasm. The cytosol contains dissolved nutrients, ions, and metabolic intermediates necessary for cellular metabolism and function.

  2. Functions:

    • Support and Structure: Cytoplasm provides structural support and shape to the cell, helping maintain its overall integrity and organization.
    • Cellular Metabolism: Many metabolic pathways and biochemical reactions occur within the cytoplasm, including glycolysis (the breakdown of glucose), protein synthesis, lipid metabolism, and various enzymatic reactions.
    • Cellular Transport: Cytoplasm serves as a medium for the movement of molecules, ions, and organelles within the cell. It facilitates intracellular transport processes such as diffusion, osmosis, and active transport.
    • Storage: Cytoplasm may store various substances, such as nutrients, ions, and waste products, in the form of granules or inclusion bodies. These stored materials can be used by the cell as needed.
  3. Organelle Distribution: Cytoplasm contains various organelles, including the endoplasmic reticulum, Golgi apparatus, mitochondria, ribosomes, and cytoskeleton, which are dispersed throughout the cytosol. These organelles perform specialized functions essential for the cell's survival and activity.

  4. Cytoskeleton: The cytoskeleton is a network of protein filaments and microtubules that extends throughout the cytoplasm, providing structural support, shape, and mechanical strength to the cell. It also plays a role in cellular movement, cell division, and intracellular transport processes.

  5. Fluidity and Dynamic Nature: Cytoplasm is dynamic and constantly undergoing changes in response to cellular activities, environmental cues, and signals from the cell's surroundings. It exhibits fluidity, allowing for the movement and rearrangement of cellular components and structures as needed for cellular function.

In summary, cytoplasm is a vital component of cells, providing a medium for cellular metabolism, transport, and structural support. It houses organelles and cellular structures, facilitates intracellular processes, and contributes to the overall function and integrity of the cell.

 
 
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Answered on 21 Feb Learn Cell – Structure and Functions

Sadika

The nucleus is a membrane-bound organelle found in eukaryotic cells, serving as the control center and genetic information repository of the cell. It is one of the most prominent and vital organelles, playing a crucial role in regulating cellular activities, storing genetic material, and coordinating... read more

The nucleus is a membrane-bound organelle found in eukaryotic cells, serving as the control center and genetic information repository of the cell. It is one of the most prominent and vital organelles, playing a crucial role in regulating cellular activities, storing genetic material, and coordinating cellular functions. Here are some key points about the nucleus:

  1. Structure: The nucleus is typically spherical or oval-shaped and surrounded by a double membrane called the nuclear envelope. The nuclear envelope consists of two lipid bilayers with nuclear pores that regulate the passage of molecules between the nucleus and the cytoplasm. The interior of the nucleus, known as the nucleoplasm, contains chromatin, nucleolus, and various nucleoplasmic proteins.

  2. Genetic Material: The nucleus houses the cell's genetic material in the form of DNA (deoxyribonucleic acid), organized into linear structures called chromosomes. Chromosomes consist of long strands of DNA wrapped around proteins called histones. The DNA contains the instructions for synthesizing proteins and controlling cellular activities, serving as the blueprint for the cell's structure and function.

  3. Chromatin and Chromosomes: Within the nucleus, the DNA exists in a dispersed, thread-like form known as chromatin during interphase, the stage of the cell cycle when the cell is not dividing. As the cell prepares for cell division, the chromatin condenses and coils tightly to form visible structures called chromosomes, which are essential for the accurate segregation and distribution of genetic material during cell division.

  4. Nucleolus: The nucleus contains one or more nucleoli, which are specialized regions responsible for the synthesis and assembly of ribosomes, the cellular structures involved in protein synthesis. The nucleolus is rich in RNA (ribonucleic acid) and proteins and appears as a dense, spherical structure within the nucleus.

  5. Regulation of Gene Expression: The nucleus plays a central role in regulating gene expression, the process by which information encoded in the DNA is used to synthesize proteins and other molecules essential for cellular function. This regulation occurs through various mechanisms, including transcription (the synthesis of RNA from DNA) and RNA processing, which take place within the nucleus before the RNA molecules are exported to the cytoplasm for translation into proteins.

  6. Cellular Communication: The nucleus communicates with other cellular organelles and structures through signaling pathways and molecular interactions. It receives signals from the cell's environment and responds by regulating gene expression, cell growth, division, and differentiation accordingly.

In summary, the nucleus is a vital organelle that serves as the command center and genetic information repository of the cell. It houses the cell's DNA, regulates gene expression, synthesizes RNA and ribosomes, and plays a central role in coordinating cellular activities and functions.

 
 
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Answered on 21 Feb Learn Cell – Structure and Functions

Sadika

Nerve cells, also known as neurons, are specialized cells of the nervous system responsible for transmitting electrical and chemical signals throughout the body. They play a crucial role in processing and transmitting information, enabling various physiological functions and behaviors. Here are some... read more

Nerve cells, also known as neurons, are specialized cells of the nervous system responsible for transmitting electrical and chemical signals throughout the body. They play a crucial role in processing and transmitting information, enabling various physiological functions and behaviors. Here are some key functions of nerve cells:

  1. Transmission of Nerve Impulses: Nerve cells are specialized for transmitting electrical impulses, known as action potentials, along their axons (long, slender projections). These action potentials allow nerve cells to rapidly communicate signals over long distances within the body, facilitating sensory perception, motor control, and intercellular communication.

  2. Integration of Information: Nerve cells receive and integrate signals from multiple sources, including other neurons, sensory receptors, and the external environment. Through the integration of these signals, nerve cells process information and generate appropriate responses, such as initiating muscle contractions or releasing neurotransmitters.

  3. Sensory Processing: Sensory neurons detect various stimuli from the environment, such as light, sound, touch, temperature, and chemicals. They transmit these sensory signals to the central nervous system (brain and spinal cord), where the information is processed and interpreted. Sensory neurons play a crucial role in sensory perception, allowing organisms to respond to changes in their surroundings.

  4. Motor Control: Motor neurons transmit signals from the central nervous system to muscles and glands, initiating muscle contractions and glandular secretion. Motor neurons play a key role in controlling voluntary movements, such as walking, running, and grasping objects, as well as involuntary processes, such as heartbeat and digestion.

  5. Interneuronal Communication: Interneurons, also known as association neurons, form connections between sensory neurons and motor neurons within the central nervous system. They integrate and relay signals between different regions of the nervous system, facilitating complex neural circuits and coordinating various physiological processes, such as learning, memory, and emotions.

  6. Neurotransmitter Release: Nerve cells release neurotransmitters, chemical messengers that transmit signals between neurons and other cells (such as muscle cells or gland cells) at specialized junctions called synapses. Neurotransmitter release enables synaptic communication and allows nerve cells to transmit signals to target cells, modulating their activity and behavior.

Overall, nerve cells play a central role in the functioning of the nervous system and are essential for processing and transmitting information, coordinating physiological responses, and regulating behavior and bodily functions. Their specialized structure and function enable the complex functions of the nervous system, allowing organisms to perceive, respond to, and interact with their environment.

 
 
 
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Answered on 21 Feb Learn Cell – Structure and Functions

Sadika

The nucleus is a membrane-bound organelle found in eukaryotic cells, serving as the control center and genetic information repository of the cell. It performs several essential functions that are crucial for the regulation of cellular activities, storage of genetic material, and coordination of cellular... read more

The nucleus is a membrane-bound organelle found in eukaryotic cells, serving as the control center and genetic information repository of the cell. It performs several essential functions that are crucial for the regulation of cellular activities, storage of genetic material, and coordination of cellular functions. Here are the main functions of the nucleus:

  1. Storage and Protection of Genetic Material: One of the primary functions of the nucleus is to store the cell's genetic material in the form of DNA (deoxyribonucleic acid). The DNA contains the hereditary instructions necessary for the synthesis of proteins and the regulation of cellular processes. The nucleus protects the DNA from damage by providing a stable and protected environment within the nuclear envelope.

  2. Regulation of Gene Expression: The nucleus plays a central role in regulating gene expression, the process by which information encoded in the DNA is used to synthesize proteins and control cellular activities. This regulation occurs through various mechanisms, including transcription (the synthesis of RNA from DNA), RNA processing, and the export of RNA molecules to the cytoplasm for translation into proteins. The nucleus contains specialized regions and structures involved in transcriptional regulation, such as promoters, enhancers, and transcription factors.

  3. Synthesis of Ribosomal RNA (rRNA) and Ribosome Assembly: The nucleus is responsible for the synthesis of ribosomal RNA (rRNA), a type of RNA molecule that forms the structural and functional components of ribosomes, the cellular organelles involved in protein synthesis. The nucleolus, a specialized region within the nucleus, is the site of rRNA synthesis and ribosome assembly. The nucleus exports newly synthesized ribosomal subunits to the cytoplasm, where they combine with proteins to form functional ribosomes.

  4. Formation of Nuclear Pores: The nucleus contains specialized channels called nuclear pores that regulate the movement of molecules between the nucleus and the cytoplasm. These nuclear pores facilitate the transport of proteins, RNA molecules, and other macromolecules into and out of the nucleus, allowing for the exchange of genetic information and regulatory signals between the nucleus and the rest of the cell.

  5. Cellular Reproduction: During cell division, the nucleus undergoes a series of coordinated events to ensure the accurate segregation and distribution of genetic material to daughter cells. The nucleus replicates its DNA, condenses it into visible chromosomes, and coordinates the process of mitosis or meiosis, depending on the type of cell division involved. The nucleus also plays a role in the formation of the nuclear envelope and the reorganization of nuclear components during cell division.

Overall, the nucleus is a vital organelle that serves as the command center and genetic information repository of the cell. It regulates gene expression, synthesizes RNA and ribosomes, controls cellular reproduction, and plays a central role in coordinating cellular activities and functions.

 
 
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Asked on 05/01/2022 Learn Cell – Structure and Functions

10. Draw a neat diagram of a Nerve Cell.

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