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Inner submucous plexus of the porcine large intestine: (A)—caecum, (B)—ascending colon, (C)—descending colon in various groups of animals: (1) control animals, (2) animals treated with BPA at a dose of 0.05 mg/kg b.w./day, (3) animals treated with BPA at a dose of 0.5 mg/kg b.w./day. Neurons showing co-localization of PGP 9.5 and NRG1 are indicated with arrows. The scale bar is 20 µm.
