Reaction catalyzed by arachidonate 15-lipoxygenase (1.13.11.33)

		+			=			+
	alpha-linolenate	+		O2	=		(9Z,11E,13S,15Z)-13-hydroperoxyoctadeca-9,11,15-trienoic acid	+		(9Z,11E,13S,15Z)-13-hydroxyoctadeca-9,11,15-trienoic acid