Fig. 7. SOCS2 interacts with CIS. (A) MAPPIT analysis. HEK293T cells were transiently co-transfected with plasmids encoding the chimeric EpoR-LR(F3) construct as a negative control or with the full-length (FL) CIS bait, and the pMG2-SOCS2 prey constructs, combined with the pXP2d2-rPAP1-luci reporter. The transfected cells were either stimulated for 24 hours with Epo or were left untreated (NS, not stimulated). Luciferase measurements were performed in triplicate. Data are expressed as mean fold induction (Epo stimulated/NS) + s.d. (B) Co-immunoprecipitation. HEK293T cells were transiently co-transfected with pMET7-Flag-SOCS2 and pMET7-Etag-CIS. Cell lysates were immunoprecipitated (IP) with anti-FLAG and subsequently immunoblotted (IB) with anti-E. (C) SOCS2 interacts with the SOCS box of CIS. HEK293T cells were transiently co-transfected with plasmids encoding the chimeric EpoR-LR(F3) construct as a negative control or with the CIS SOCS box bait, and the pMG2-SOCS2 prey construct or the appropriate amount of mock vector, combined with the pXP2d2-rPAP1-luci. The transfected cells were either stimulated for 24 hours with Epo or were left untreated (NS, not stimulated). Luciferase measurements were performed in triplicate. Data are expressed as mean fold induction (Epo stimulated/NS) + s.d.