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protoplast

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protoplast /pro·to·plast/ (-plast) a bacterial or plant cell deprived of its rigid wall but with its plasma membrane intact; the cell is dependent for its integrity on an isotonic or hypertonic medium.
pro·to·plast (prt-plst)
n.
1. The living material of a plant or bacterial cell, including the protoplasm and plasma membrane after the cell wall has been removed.
2. One that is the first made or formed; a prototype.
protoplast
a bacterial or plant cell deprived of its rigid wall but with its plasma membrane intact; the cell is dependent for its integrity on an isotonic or hypertonic medium. In bacteria, specifically refers to gram-positive organisms. See also spheroplast.
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