when rna labeled with [ ( 3 ) h ] uridine for 2 hr and chased for 1 or 2 hr was electrophoresed on aqueous polyacrylamide gels , most of the radioactivity not in 28s or 18s rrna migrated with an apparent molecular weight of about 1,800,000 .
C0035668
rna
C0035701
rrna