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Fig. 1. Spontaneous heart rate (fH) of 5°C, and 21°C,
normoxia- and anoxia-acclimated control preparations during the control
experiments. Adrenaline concentration (nmol l1) is indicated
in parentheses. Significant differences (P<0.05) in
fH among time points within an experimental group are
indicated by different letters. Values are means ± s.e.m.; N=6
except for the 5°C normoxia-acclimated experimental group where
N=5, unless otherwise indicated in parentheses.