Involved in the production of 12-oxo-phytodienoic acid (OPDA), a precursor of jasmonic acid. (9Z,13S,15Z)-12,13-epoxyoctadeca-9,11,15-trienoate = (10Z,15Z)-12-oxophytodienoate Highly expressed in fully developed leaves. Low local and systemic induction by wounding. The four allene oxide cyclase proteins (AOC1, AOC2, AOC3 and AOC4) are encoded by duplicated genes. They are very similar, and most experiments involving antibodies do not discriminate between the different members. Belongs to the allene oxide cyclase family.