studies of the sedimentation properties of rnp ( 1 ) material from the nucleus of the amphibian oocyte have indicated ( 1 ) that there are few , if any , 78s ribosomes in the nucleus , ( 2 ) that there are smaller particles sedimenting at 50-55s and 30s , and ( 3 ) that the larger of these is the precursor of the 60s subunit of the cytoplasmic ribosomes .
C0035553
ribosomes
C0010834
cytoplasmic