Homo sapiens C/D box snoRNA U83A. This snoRNA, as well as U83B, was characterized by the examination of conserved sequences in introns of the RPL3 gene (Duga et al., 2000). The expression of U83A/B was experimentally verified in human HeLa cells. Both U83A and B have no documented RNA target. They share the same host gene with the C/D box snoRNA U43, and have no sequence similarity with the U83 snoRNA cloned by Jady and Kiss (2000).