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Cytoplasm is the viscid, semifluid matter contained within the plasma membrane of a cell. In contrast to the
protoplasm, however, the cytoplasm does not include the cell nucleus. The watery or aqueous
component of the cytoplasm is the cytosol, which includes ions and soluble macromolecules, for example enzymes. The insoluble constituents of the cytoplasm include the organelles and the cytoskeleton, which gives to the
cytoplasm a gel-like structure and consistency. While all cells possess a cytoplasm, cells
from the different biological domains and kingdoms can differ widely in the characteristics of their
cytoplasms.
See also : microtubules, vesicle
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