... Weight: 149.21 Manufacture Standards: AJI92,USP26,EP4 L-MethionineIndications and UsageMethionine (abbreviated as Met or M) ... Methionine is an intermediate in the biosynthesis of cysteine, carnitine, taurine, lecithin, phosphatidylcholine, and other phospholipids. Improper ... by post-translational modification. In bacteria, the derivative N-formylmethionine is used as the initial amino acid. ...