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Fig. 1. PACAP and VIP immunoreactivities in the gastrointestinal tract of Xenopus laevis. (A,B) Extensive networks of PACAP-immunoreactive nerve fibres in the myenteric plexus of the distal intestine (A) and rectum (B). (C) PACAP-immunoreactive nerve cell body in the myenteric plexus of the pyloric stomach. (D) PACAP-immunoreactive endocrine cells (arrows) and nerve fibres (arrowhead) in the mucosa of the proximal intestine. (E) VIP-immunoreactive myenteric nerve cell in the distal intestine. Bars: 25 µm (C,E), 50 µm (A,D), 100 µm (B).