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Fig. 9. Femoral arterial pressure and heart rate before (open bars) and after (closed bars) injection of phenylephrine (PE; 120 µg kg–1) and sodium nitroprusside (SNP; 100 µg kg–1) in hatchlings pre-treated with atropine (3 mg kg–1). Data are means ± S.E.M. (N=6). Asterisks indicate a significant response to the drug (P<0.05).