. "Cytosolic 4-trimethylaminobutyraldehyde dehydrogenase tetramer (ALDH9A1) catalyzes the reaction of NAD+', and 4-trimethylammoniobutanal to form 4-Trimethylammoniobutanoate and NADH + H+ (Kurys et al. 1989; Vaz et al. 2000)."^^ . . . . . . . "gamma-butyrobetaine semialdehyde + NAD+ => gamma-butyrobetaine + NADH + H+"^^ . . . . . . . . . .