Term Name:	C-22 sterol desaturase activity
Synonyms:
Definition:	Catalysis of the formation of the C-22(23) double bond in the sterol side chain. An example reaction: 5,7,24(28)-ergostatrienol + O2 + NADPH = 5,7,22,24(28)-ergostatetraenol + 2 H2O + NADP+.
Ontology:	GO: Molecular Function [GO:0000249]   QuickGO   AmiGO