**) Representative photomicrographs of immunohistochemistry for β-tubulin III and GFAP in enteric cell cultures after treatment with rotenone (0 nM) and CA (00 µM) or CGA (00 µM). Red: β-tubulin III-positive enteric neuronal cells. Green: GFAP-positive enteric glial cells. Blue: nuclear staining with Hoechst 00000. Scale bar = 000 µm. (**