Figure 4. Increased basal proton conductance of skeletal muscle mitochondria from immersed, never-immersed and naturally adapted penguins.

Data from Figs 1A, 2A and 3A. Skeletal muscle mitochondria (0.35 mg ml⁻¹) from either never-immersed (NI) (♦) (n = 5), immersed (im) (♦) (n = 6), or naturally adapted (NA) (•) (n = 8) penguins were incubated in assay buffer containing 0.3% BSA and 150 μm palmitate and the kinetics of the proton conductance were obtained by varying the potential with malonate using 4 mm succinate as substrate. All data are means ± s.e.m.