Three pseudogenes for human U13 snRNA belong to class III.

The nucleotide sequences of three pseudogenes for the small nucleolar RNA, U13, were determined from three human DNA clones. The sequences are reported 50 bp 5' and 3' to each gene. These pseudogenes belong to class III because they contain dispersed mismatches when compared to the previously determined U13 RNA sequence, an adenine-rich region at the 3' end, and short imperfect repeats flanking the 5' end of the coding sequence and the 3' end of the adenine-rich region.