Changes in the expressions of Tau, P-Ser396-Tau, P-Ser404-Tau, p38 and p-p38 proteins in the distal colonic musculatures of four groups of rats after 4 days of in vivo drug intervention. A and B, Protein expressions of Tau, P-Ser396-Tau, P-Ser404-Tau, p38 and p-p38. C-G, Statistical analysis of Tau, P-Ser396-Tau, P-Ser404-Tau, p38 and p-p38 expressions.