Oxidoreductases Acting on CH-CH Group Donors article 10 Oxidoreductases 8 oxidoreductase 8 Flavoproteins 6 Mitochondrial Proteins 6 Protoporphyrinogen Oxidase 6 enzymology 6 genetics 6 protoporphyrinogen oxidase 6 Animals 4 Humans 4 PPOX protein, human 4 Porphyrias, Hepatic 4 Porphyrins 4 enzyme activity 4 flavoprotein 4 gene expression regulation 4 hepatic porphyria 4 human 4 metabolism 4 mitochondrial protein 4 nonhuman 4 porphyrin 4 5 aminolevulinate synthase 2 Alkylating Agents 2 Altretamine 2 Amino Acid Substitution 2 Animalia 2 Antineoplastic Agents 2