Small nucleolar RNA SNORD21

In molecular biology, 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.

Small nucleolar RNA SNORD21
Predicted secondary structure and sequence conservation of SNORD21
Identifiers
Symbol	SNORD21
Alt. Symbols	U21
Rfam	RF00068
Other data
RNA type	Gene; snRNA; snoRNA; CD-box
Domain(s)	Eukaryota
GO	GO:0006396 GO:0005730
SO	SO:0000593
PDB structures	PDBe