Kothapalli KSD, Ye ,K, Gadgil MS, Carlson SE, O’Brien KO, Zhang JY, Park HG, Ojukwu K, Zou J, Hyon SS, Joshi KS, Gu Z, Keinan A, Brenna JT. Positive Selection on a Regulatory Insertion–Deletion Polymorphism inFADS2Influences Apparent Endogenous Synthesis of Arachidonic Acid. Mol Biol Evol. 2016 Mar 29;33(7):1726–39. doi: 10.1093/molbev/msw049.