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Fig. 2. Absolute changes in (A,C) heart rate (fH) and (B,D) mean arterial pressure (a) in response to hypoxia (15% and 10% O2) in embryonic emus. Asterisks indicate significant difference (P<0.05) from zero. All data are presented as means ± 1 S.E.M. N=5 for each incubation period studied.