Stands for small nuclear RNA. The transcription of DNA inside the nucleus creates mRNA which goes outside the nucleus to the ribosomes to create the proteins it codes for. But genes on DNA are quite messy, not strung linearly out like beads, so the first draft or primary transcript of the DNA strand does not encode the gene accurately.

snRNA molecules are RNA helpers that edit the primary transcript, removing introns and splicing the exons. Several forms of snRNA and proteins combine into a spliceosome (sic, it's a new one on me too) to do this. The corrected mRNA is then ready to leave the nucleus for the cytoplasm.

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