Table 1. Classes of small Cajal body (sca) RNAs
scaRNAsFunctionConserved motifsCommon proteins
U85, U87, U88, U89Specify site of both ribose methylation and pseudouridine formation in U5 and U4 snRNAsBox C/D, Box H/ACAFibrillarin, Gar1p
U90, U91Specify site of ribose methylation in U1 and U4 snRNAsBox C/DFibrillarin
U92Specify site of pseudouridine formation in U2 snRNABox H/ACAGar1p