KEGG Orthology (KO) [BR:ko00001] 09100 Metabolism 09108 Metabolism of cofactors and vitamins 00860 Porphyrin metabolism [PATH:ko00860] K00218 por; protochlorophyllide reductase [EC:1.3.1.33] Enzymes [BR:ko01000] 1. Oxidoreductases 1.3 Acting on the CH-CH group of donors 1.3.1 With NAD+ or NADP+ as acceptor 1.3.1.33 protochlorophyllide reductase K00218 por; protochlorophyllide reductase [EC:1.3.1.33]