Porphyrinogens 40 nonhuman 40 article 38 animal experiment 34 porphyrinogen 30 Liver 28 rat 28 Female 26 Rats 26 controlled study 26 liver 26 porphyria 26 Animals 22 Support, Non-U.S. Gov't 22 animal model 22 enzyme activity 22 Animal 20 Carboxy-Lyases 20 hexachlorobenzene 20 uroporphyrinogen decarboxylase 20 Hexachlorobenzene 18 Porphyria 18 Porphyrins 18 female 18 metabolism 18 animal tissue 16 mouse 16 porphyrin 16 Male 14 Rats, Wistar 14