Porphobilinogen Synthase porphobilinogen synthase 94 article 74 Support, Non-U.S. Gov't 54 Liver 40 nonhuman 38 porphyrin 38 Male 36 Porphyrins 36 Animal 34 animal experiment 28 liver 28 metabolism 28 5-Aminolevulinate Synthetase 26 human 26 Animals 24 Heme 24 Mice 24 mouse 24 priority journal 24 5 aminolevulinate synthase 22 Ammonia-Lyases 22 controlled study 22 Female 20 Hydroxymethylbilane Synthase 20 male 20 Adult 18 Erythrocytes 18 Human 18 Kinetics 18