Nepsilon-trimethyllysine

Nε-tri·meth·yl·ly·sine

(trī-meth'il-lī'sēn),
An amino acid residue found in a number of proteins by the action of S-adenosyl-l-methionine on l-lysyl residues; upon release by proteolysis, Nε-trimethyllysine becomes the precursor of carnitine.