| polysome | <cell biology> Functional unit of protein synthesis consisting of several ribosomes attached along the length of a single molecule of mRNA. Origin: Gr. Soma = body (18 Nov 1997) |
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| polysomes | A multiribosomal structure representing a linear array of ribosomes held together by messenger RNA (RNA, messenger). They represent the active complexes in cellular protein synthesis and are able to incorporate amino acids into polypeptides both in vivo and in vitro. (12 Dec 1998) |