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Fig. 5. Original tracings showing the effect of PACAP 27 (A; 10-7 mol l-1), VIP (B; 10-6 mol l-1), NaNP (C; 10-7 and 10-6 mol l-1), GABA (D; 10-7-10-4 mol l-1) and L-NAME (E; 3x10-4 mol l-1) on the cardiac stomach of Xenopus laevis. The appearance of spontaneous activity varied between individual preparations. PACAP 27, VIP, NaNP and GABA reduced the resting tension while the NOS inhibitor L-NAME enhanced the activity.





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