Natural variants of human p85 alpha phosphoinositide 3-kinase in severe insulin resistance: a novel variant with impaired insulin-stimulated lipid kinase activity. - Baynes,K.C.; Beeton,C.A.; Panayotou,G.; Stein,R.; Soos,M.; Hansen,T.; Simpson,H.; O’Rahilly,S.; Shepherd,P.R.; Whitehead,J.P. (Diabetologia, 2000)