Mouse cells were lysed as described previously6 (link). Protein extracts were fractionated on 8% (for LMP1 immunoblot), 10% (for Trp1 immunoblot) or 15% (for Survivin and EphA2 immunoblots) sodium dodecyl sulfate polyacrylamide gels, transferred onto polyvinylidene difluoride membranes and immunoblotted with the following primary antibodies: anti-LMP1 (clone S12, 1:4; obtained as described previously9 (link)), anti-Survivin (clone 71G4B7, 1:1000; Cell Signaling), anti-EphA2 (clone C-3, 1:200; Santa Cruz), anti-Trp1 (clone TA99, 1:100; Santa Cruz), anti-Flag (clone M2, 1:5000; Sigma) and anti-GAPDH (clone 2118, 1:1000; Cell Signaling). Images were taken with ImageQuant LAS 4000 using ImageQuant LAS 4000 v1.2 software (both GE Healthcare Life Sciences).