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Fig. 5. Effects of 10–6 mol l–1 endothelin (ET-1) and 10–2 mol l–1 sodium nitroprusside (SNP) on the normalized diameter of the main artery to the head (normalized to the diameter under control conditions) in Xenopus laevis tadpole. Arrowheads indicate the time of drug injections. Values are means ± S.E.M. (N=6). Asterisks indicate significant differences from the control period.





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