A ribonucleoprotein complex that contains an RNA molecule of the snoRNA family, and cleaves the rRNA precursor as part of rRNA transcript processing. It also has other roles: In S. cerevisiae it is involved in cell cycle-regulated degradation of daughter cell-specific mRNAs, while in mammalian cells it also enters the mitochondria and processes RNAs to create RNA primers for DNA replication. [GOC:sgd_curators, PMID:10690410, PMID:14729943, PMID:7510714]
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C5: Ontology GO: Gene Ontology GO:CC: GO Cellular Component