Most one‑carbon transfers are promoted by one of three cofactors: biotin, tetrahydrofolate, or S‑adenosylmethionine. S‑Adenosylmethionine is generally used as a methyl group donor; the transfer potential of the methyl group in N5 ‑methyltetrahydrofolate is insufficient for most biosynthetic reactions. However, one example of the use of N5 ‑methyltetrahydrofolate in methyl group transfer is in methionine formation by the methionine synthase reaction; methionine is the immediate precursor of S‑adenosylmethionine. List the three methyl donors in order of methyl group transfer potential highest to lowest.