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Fig. 1. Mean proton leak rates (± s.e.m.) at 20°C as a function of
membrane potential (± s.e.m.) for mitochondria isolated from the slow,
oxidative (red) locomotor muscle of three shark species: shortfin mako
(N=5), blue (N=4) and leopard (N=5) sharks. Proton
leak rates were calculated by assuming the H+:O ratio of 6 when
using succinate as the respiratory substrate. Proton leak rates at 160 mV in
red muscle mitochondria did not differ significantly among the three species
(ANOVA, P=0.313).