Growth hormone and prolactin stimulate tyrosine phosphorylation of insulin receptor substrate-1, -2, and -3, their association with p85 phosphatidylinositol 3-kinase (PI3-kinase), and concomitantly PI3-kinase activation via JAK2 kinase. - Yamauchi,T.; Kaburagi,Y.; Ueki,K.; Tsuji,Y.; Stark,G.R.; Kerr,I.M.; Tsushima,T.; Akanuma,Y.; Komuro,I.; Tobe,K.; Yasaki,Y.; Kadowaki,T. (J Biol Chem, 1998)