Western blot analysis of extracts from Xenopus oocytes overexpressing Myc-tagged p38 isoforms, using p38δ MAPK Antibody (upper) and Myc-tag antibody (lower). Results show the isoform specificity of CST's p38δ MAPK Antibody. (Provided by Dr. Eusebio Perdiguero and Dr. Angel Nebreda, European Molecular Biology Laboratory, Germany.)