The rabbit polyclonal PIPKIγ antibody was generated and purified as described previously (6 (link)). Antibodies against phosphorylated AKT (pSer473), total AKT, phosphorylated ERK1/2 (pThr202/Tyr204), total ERK1/2, phosphorylated STAT3 (pTyr705), total STAT3, phosphorylated JAK2 (pTyr1007/1008) and total JAK2 were procured from Cell Signaling Technology (Danvers, MA, USA). Antibody for β-actin was purchased from Sigma-Aldrich.