. "In the reverse direction L-lysine can act instead of L-ornithine, more slowly." . "Acts on the amino group (cf. EC 1.5.1.16)." . . . "N(5)-(carboxyethyl)ornithine synthase" . "N(5)-(L-1-carboxyethyl)-L-ornithine + NADP(+) + H(2)O = L-ornithine + pyruvate + NADPH." .