N1-Methylpseudouridine (abbreviated m1Ψ) is a natural archaeal tRNA component, and "hypermodified" pyrimidine nucleoside used in biochemistry and molecular biology for in vitro transcription and is found in the SARS-CoV-2 mRNA vaccines tozinameran (Pfizer–BioNTech) and elasomeran (Moderna).
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