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Representative electron micrograph showing ultrastructure of the small (a–c) and large intestine (d–f) from control mice (a,d) and mice treated with 500 µg/kg bw TTX (b,c,e,f). Dilation of rer was detected in small and large intestine. (a–c) scale bar = 2 µm, (d–f) scale bar = 1 µm. endosome (arrow head), microvilli (Mv), mitochondria (m), nucleus (N), rough endoplasmic reticulum (rer), swollen rer (arrow), and tight juntion (Tj).
