Cells within an organism can be very different from one another. For example, human red blood cells are filled with hemoglobin, are shaped like biconcave discs, lack a cell nucleus, and cannot synthesize proteins. Human muscle cells, on the other hand, are cylindrical in shape and have multiple nuclei. Cell specialization in the human body is usually due to
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Cells within an organism can be very different from one another. For example, human red blood cells...
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