Notes: N4-Methylcytidine is a pyrimidine nucleoside and derivative of cytidine (Item No. 29602).{72403} It is found in mammalian mitochondrial rRNA where it stabilizes the structure of 12S rRNA and is essential for mitochondrial translation of oxidative phosphorylation-related proteins. N4-Methylcytidine maintains normal base pairing with the purine base guanine (Item No. 34248) in RNA oligomers.{72404}