Succinate-CoA Ligases 22 5-Aminolevulinate Synthetase 16 Porphyrins 16 Support, Non-U.S. Gov't 14 5 aminolevulinate synthase 12 Porphobilinogen Synthase 12 article 12 porphobilinogen synthase 12 porphyrin 12 succinyl coenzyme A synthetase 12 Coenzyme A Ligases 10 Succinate CoA Ligases 10 biosynthesis 10 metabolism 10 Heme 8 Plants 8 Soybeans 8 enzymology 8 heme 8 Cells, Cultured 6 Comparative Study 6 Kinetics 6 enzyme 6 nonhuman 6 succinyl coenzyme a synthetase 6 Aminolevulinic Acid 4 Ammonia Lyases 4 Ammonia-Lyases 4 Animal 4 Clone Cells 4