article Animal Liver Porphobilinogen Synthase Support, Non-U.S. Gov't controlled study liver nonhuman porphobilinogen synthase 5-Aminolevulinic acid dehydratase Active site residues inhibition Age Factors Animals Carboxy-Lyases Chick Embryo Enzyme Inhibitors Female Glucose effect Hexachlorobenzene Hydroxymethylbilane Synthase Kinetics Levulinic Acids Lysine Lysine residues Models, Molecular Porphobilinogen Porphyria Pyridoxal 5-phosphate Pyridoxal Phosphate Pyridoxamine