resolution of nuclear rna into poly ( a ) -poor and poly ( a ) -rich rna species by chromatography on oligo ( dt ) -cellulose , followed by polyacrylamide-gel electrophoresis with sodium dodecyl sulphate or in the pressence of 99 % formamide , revealed that the hormone caused a preferential enhancement of high-molecular-weight ( 25s-60s ) poly ( a ) -rich hnrna ( heterogeneous nuclear rna , ) much of which was associated with euchromatin and not with the nuclear sap .
C0035700
nuclear rna
C0035695
heterogeneous nuclear rna