Western blot analysis of active p42 MAP Kinase, active p38 MAPK and active JNK2 proteins, as well as extracts from PDGF-treated NIH/3T3 cells and EGF-treated A431 cells, using Phospho-p44/42 MAPK (Erk1/2) (Thr202/Tyr204) (20G11) Rabbit mAb.