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Fig. 8. Chorioallantoic membrane mean arterial pressure (a) and heart rate (fH) before (open bars) and after (closed bars) injection of phenylephrine (120 µg kg–1) in 80% and 90% embryos pre-treated with atropine (3 mg kg–1). Notice that phenylephrine has significant effects on pressure but no effects on heart rate. Data are means ± S.E.M. (N=6). Asterisks indicate a significant response to the drug (P<0.05).