and fourth , the fraction of total nonribosomal nuclear rna complementary to the nine cloned dna segments is in most cases 10 fold less than the fraction of cytoplasmic mrna complementary to the same cloned dna segments , suggesting the synthesis of many hnrna molecules that are qualitatively different from those which eventually contribute mrna to the cytoplasm .
C0035700
nuclear rna
C0035695
hnrna