when the detergent-treated postmitochondrial fraction from cells incubated for 60 min with [ 3h ] -uridine was centrifuged through a 0.3 m nac1/0.5 m sucrose cushion , the resulting pellet showed a marked increase in the ratio of counts a/4 s rna , and particularly b/4 s rna , suggesting that these rnas might not exist free in the cytoplasm .
C0007634
the
C0010834
cytoplasm