Small nucleolar RNA SNORD21

U21 is a member of the C/D class of snoRNA which contain the C (UGAUGA) and D (CUGA) box motifs. U21 is encoded within an intron of the gene for ribosomal protein L5 in mammals [1] , but within introns of the ADP ribosylation factor gene in Drosophila [2] . U21 snoRNA has a 13 nucleotide region of complementarity with an invariant region of eukaryotic 28S ribosomal RNA.

References

* [1] cite journal | last = Qu | first = LH | coauthors = Nicoloso M, Michot B, Azum MC, Caizergues-Ferrer M, Renalier MH, Bachellerie JP | year = 1994 | title = U21, a novel small nucleolar RNA with a 13 nt. complementarity to 28S rRNA, is encoded in an intron of ribosomal protein L5 gene in chicken and mammals | journal = Nucleic Acids Res | volume = 22 | pages = 4073–4081 | pmid = 7937132 | doi = 10.1093/nar/22.20.4073
* [2] cite journal | last = Renalier | first = MH | coauthors = Nicoloso M, Qu LH, Bachellerie JP | year = 1996 | title = SnoRNA U21 is also intron-encoded in Drosophila melanogaster but in a different host-gene as compared to warm-blooded vertebrates | journal = FEBS Lett | volume = 379 | pages = 212–216 | pmid = 8603691 | doi = 10.1016/0014-5793(95)01511-6

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