snRNA U12_snRNA The U12 small nuclear (snRNA), together with U4atac/U6atac, U5, and U11 snRNAs and associated proteins, forms a spliceosome that cleaves a divergent class of low-abundance pre-mRNA introns. snRNA U12 http://en.wikipedia.org/wiki/U12_snRNA U12 snRNA SO:0000399 small nuclear RNA U12 U12 small nuclear RNA sequence