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Fig. 6. Heart rate of zebrafish larvae between 2 d.p.f. and 12 d.p.f. under normoxic conditions (PO2=20 kPa) and progressive hypoxia down to anoxic conditions. Values are means ± S.E.M. *Significant differences between normoxia and hypoxic conditions (P<0.05). N values are given in parentheses below each symbol.