The U18 snRNA is not essential for pre-rRNA processing in Xenopus laevis.
Dunbar D, Ware V, Baserga S. The U18 snRNA is not essential for pre-rRNA processing in Xenopus laevis. RNA 1996, 2: 324-33. PMID: 8634913, PMCID: PMC1369375.Peer-Reviewed Original Research