heterogenous nuclear RNA

heterogenous nuclear RNA
(= hnRNA)
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.

Dictionary of molecular biology. 2004.

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