A ribonucleoprotein complex containing a box C/D type RNA that can carry out ribose-2'-O-methylation of target RNAs. Box C/D type RNAs are widespread in eukaryotes and in Archaea, suggesting that an RNA-based guide mechanism for directing specific RNA 2'-O-ribose methylations was present in the common ancestor of Archaea and Eukarya. [ISBN:0879695897, PMID:11842104, PMID:17284456]
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C5: Ontology GO: Gene Ontology GO:CC: GO Cellular Component