This subfamily includes several Arabidopsis thaliana cytochrome P450s (CYP86A1, CYP86A2, CYP86A4, among others), Petunia x hybrida CYP86A22, and Vicia sativa CYP94A1 and CYP94A2. They are P450-dependent fatty acid omega-hydroxylases that catalyze the omega-hydroxylation of various fatty acids. CYP86A2 acts on saturated and unsaturated fatty acids with chain lengths from C12 to C18; CYP86A22 prefers substrates with chain lengths of C16 and C18; and CYP94A1 acts on various fatty acids from 10 to 18 carbons. They play roles in the biosynthesis of extracellular lipids, cutin synthesis, and plant defense. The CYP86A subfamily belongs to the large cytochrome P450 (P450, CYP) superfamily of heme-containing proteins that catalyze a variety of oxidative reactions of a large number of structurally different endogenous and exogenous compounds in organisms from all major domains of life. CYPs bind their diverse ligands in a buried, hydrophobic active site, which is accessed through a substrate access channel formed by two flexible helices and their connecting loop.