lysine metabolism has been measured in rats fed a diet low in trimethyl-lysine and carnitine (Davis & Hoppel, 1983, 1986). Under these steady-state conditions, the total body trimethyl-lysine content is similar to the total body carnitine content. The tissue distribution of peptide-linked and free trimethyl-lysine shows that approximately 68% of the total trimethyl-lysine is present in skeletal...