the glutamic acid decarboxylase inhibitor 4-deoxypyridoxine decreased the endogenous concentration of gaba and it inhibited the increase in gaba induced by gamma-acetylenic gaba in the substantia nigra and in the pituitary gland , but not in the corpus callosum , indicating that this compound inhibits the decarboxylase mainly in the gaba nerve terminals .
C0017785
glutamic acid decarboxylase
C0007054
decarboxylase