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Figure 1


Fig. 1. (A) The percentage of fast-oxidative fibers (Type IIA) increased significantly in the swimming muscle as seals matured and increased their dive durations. Histogram showing the change in fiber type composition (% of total fiber number), in the swimming (longissimus dorsi) muscles of Weddell seals as they mature. (B) The mitochondrial volume densities in the swimming muscles decreased as the seals matured. Histogram showing the decrease in the volume density of mitochondria in the swimming muscle of Weddell seals as they mature. Values are means ± s.e.m. (N=6). * denotes significantly different from the pups; {dagger} denotes significantly different from adults (P<0.05, ANOVA).