porphobilinogenase article 24 Ammonia-Lyases 22 Support, Non-U.S. Gov't 18 5 aminolevulinate synthase 14 Animal 14 unclassified drug 14 Liver 12 nonhuman 12 Heme 10 Hydrogen-Ion Concentration 10 Mice 10 Porphyrins 10 ammonia lyase 10 animal experiment 10 liver 10 metabolism 10 mouse 10 porphyrin 10 priority journal 10 5-Aminolevulinate Synthetase 8 Kinetics 8 Saccharomyces cerevisiae 8 acute intermittent porphyria 8 animal tissue 8 controlled study 8 porphobilinogen deaminase 8 porphobilinogen synthase 8 Aminolevulinic Acid 6 Ammonia Lyases 6