See Also: heterogenous nuclear RNA(medicine)
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heterogenous nuclear RNA (medicine)


heterogenous nuclear RNA
<molecular biology> Originally identified as a class of RNA, found in the nucleus but not the nucleolus, which is rapidly labelled and with a very wide range of sizes, 2-40 kilobases.

It represents the primary transcripts of RNA polymerase II and includes precursors of all messenger RNAs from which introns are removed by splicing.