Western blot and densitometry of phosphorylation of MAPK p38α and JNK. P-p38α (A) and p-JNK (B) after treatment with 15 ng/ml Stx2 and in combination with SAP (3 mg/liter) after 60, 180, or 480 min. Below are shown loading controls with GAPDH. *, P < 0.05. Means and standard errors of the means of five independent experiments, performed in duplicate, are shown.