Some of these species contained DHA, a fatty acid that is formed from tetracosahexaenoic acid (C24:6ω-3) by peroxisomal β-oxidation, and which is known to be decreased in patients with ACOX1- and DBP deficiency (Ferdinandusse et al 2001). The gene discussed is ACOX1; the disease is hyperinsulinemic hypoglycemia, familial, 4.