Enables arachidonate 12(S)-lipoxygenase activity and linoleate 13S-lipoxygenase activity. Involved in arachidonic acid metabolic process and lipoxygenase pathway. Predicted to be located in cytoplasm. Predicted to be active in cytosol and plasma membrane. Is expressed in alimentary system; hemolymphoid system; integumental system; and respiratory system. [provided by Alliance of Genome Resources, Apr 2022]