Immunohistochemistry of the colonic myenteric plexus tissues from normal rats. A, (A1) Tau-positive cells; (A2) NeuN-positive cells; (A3) Intracellular co-expressions of Tau and NeuN. (B1) P-Ser396-Tau-positive cells; (B2) NeuN-positive cells; (B3) Intracellular co-expressions of P-Ser396-Tau and NeuN. (C1) P-Ser404-Tau-positive cells; (C2) NeuN-positive cells; (C3) Intracellular co-expressions of P-Ser404-Tau and NeuN. B, (A1) Tau-positive cells; (A2) MOR-positive cells; (A3) Co-expressions of Tau and MOR markers in enteric neural cells. (B1) P-Ser396-Tau-positive cells; (B2) MOR-positive cells; (B3) Co-expressions of P-Ser396-Tau and MOR in enteric nerve cells. (C1) P-Ser404-Tau-positive cells; (C2) MOR-positive cells; (C3) P-Ser404-Tau and MOR double-positive enteric nerve cells. C, (A1) PKC-positive cells; (A2) MOR-positive cells; (A3) Co-expressions of PKC and MOR in enteric nerve cells. (B1) P38-positive cells; (B2) MOR-positive cells; (B3) Co-expressions of p38 and MOR in enteric nerve cells. (C1) P-p38-positive cells; (C2) MOR-positive cells; (C3) Co-expressions of p-p38 and MOR in enteric nerve cells. Scale bars: 20µm.