Definition: Nuclear nonribosomal RNA larger than about 1000 nucleotides, the mass of which is rapidly synthesized and degraded within the cell nucleus. Some heterogeneous nuclear RNA may be a precursor to mRNA. However, the great bulk of total hnRNA hybridizes with nuclear DNA rather than with mRNA.
IM; /drug eff /ultrastruct permitted; DF: HNRNA
Other names Heterogeneous Nuclear RNA; Nuclear RNA, Heterogeneous
