article 164 porphobilinogen synthase 120 nonhuman 114 Porphobilinogen Synthase 104 Support, Non-U.S. Gov't 94 Liver 90 porphobilinogen deaminase 78 animal experiment 76 porphyrin 76 Animal 70 controlled study 68 Porphyrins 66 enzyme activity 66 priority journal 66 male 64 5 aminolevulinate synthase 60 Male 60 5-Aminolevulinate Synthetase 58 liver 56 Animals 54 Hydroxymethylbilane Synthase 54 mouse 54 animal tissue 52 rat 50 Mice 48 metabolism 48 human 46 Female 44 Rats 42 Heme 40