several aspects of figure 9 are worthy of note : it is now well established that polypeptide synthesis is initiated on free cytoplasmic polysomes and that once sufficient nascent subunits bearing signal peptides at the amino terminus is formed , polysomes assemble with the membranes of the rough endoplasmic reticulum via a mechanism that employs the signal recognition particle ( anderson et al . 1982 ) .
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cytoplasmic
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the membranes of