heterogeneous nuclear RNA

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An assortment of RNA molecules assembled around newly transcribed RNA (pre-messenger RNA, or pre-mRNA) in the cell nucleus. The hnRNA associates with proteins to form heterogeneous nuclear ribonucleoprotein (hnRNP). After release from the chromosome and processing of the pre-mRNA by the spliceosome (see intron), the mature messenger RNA remains associated with various proteins, forming a messenger ribonucleoprotein (mRNP), which is then exported from the nucleus. See RNA processing.

Subjects: Chemistry — Biological Sciences.

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