Ammonia-Lyases 24 ammonia lyase article 24 Ammonia Lyases 20 Support, Non-U.S. Gov't 20 enzymology 16 metabolism 14 Molecular Weight 12 Porphyrins 12 biosynthesis 12 molecular weight 12 porphyrin 12 Porphobilinogen Synthase 10 porphobilinogen synthase 10 porphobilinogenase 10 Animal 8 Erythrocytes 8 Euglena gracilis 8 Human 8 Porphyria 8 animal 8 comparative study 8 erythrocyte 8 human 8 porphyria 8 5 aminolevulinate synthase 6 5-Aminolevulinate Synthetase 6 Chromatography, Gel 6 Comparative Study 6 Heme 6