Rabbit reticulocytes, separated into ten cell age groups by bovine serum albumin density-gradient sedimentation, were pulse-labelled with [14C]leucine in the presence of either puromycin dihydrochloride or aminoethyl-L-cysteine (a lysine analogue). Intracellular proteolysis of both the puromyucinyl-peptides and analogue-containing protein decreased with cell maturity.
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McKay et al. (1980) studied this question.
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