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Fig. 4. Effects of acute hypoxic exposure to 15%O2 on a (A) and heart rate (B) at different incubation ages in embryos incubated in normoxic conditions (group N21). White bars, control; grey bars, hypoxic response; black bars, post-hypoxic response. *Significant difference from control. Values are means ± S.E.M. For N values, see Table 1.