Homo sapiens C/D box snoRNA U21. This snoRNA was initially characterized by a bioinformatics search for C/D motives in a vertebrate intron database (Qu et al. 1994). U21 was postulated to guide the 2'O-ribose methylation of 28S rRNA G1303 by Kiss-Laszlo et al. (1996), although this 2'O-methylated base was not mapped by Maden (1990). U21 shares the same host gene with the H/ACA box snoRNA U66 (RPL5).
GenBank accession number :
Host gene : RPL5 (ribosomal protein L5)
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