delta7-sterol 5(6)-desaturase activity https://github.com/geneontology/go-ontology/issues/21133 https://github.com/geneontology/go-ontology/issues/27381 https://github.com/geneontology/go-ontology/issues/28070 https://github.com/geneontology/go-ontology/issues/30815 RHEA:54320 5-DES MetaCyc:RXN-16378 EC:1.14.19.20 MetaCyc:RXN-4209 RHEA:46556 delta7-sterol 5-desaturase activity molecular_function lathosterol 5-desaturase activity delta7-sterol delta5-dehydrogenase activity GO:0050046 RHEA:46560 Catalysis of the reaction: a Delta(7)-sterol + 2 Fe(II)-[cytochrome b5] + O2 + 2 H+ = a Delta(5),Delta(7)-sterol + 2 Fe(III)-[cytochrome b5] + 2 H2O. lathosterol oxidase activity delta7-sterol-C5(6)-desaturase activity sterol desaturase activity