Pseudouridine occurs naturally in some RNAs. But what about the methylated variant of it, N1-methyl-pseudouridine? The latter is a key ingredient in both the Pfizer and Moderna Covid-19 vaccines, probably due to its relative "potency" in evading immunogenicity to exogenous mRNA itself and its ability to apparently put ribosomes in a sort of "overdrive". (It's use in mRNA therapeutics has been patented by Moderna in 2012 or so.)
Does N1-methyl-pseudouridine occur naturally, in particular, does it occur in RNA?