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Fig. 2. Rate of oxygen consumption (O2) at rest and during maximum levels of sustained aerobic exercise on a treadmill for V. mertensi. The large solid symbols represent data collected during experimental runs, the small symbols connected by dashed lines represent data obtained pre- (small closed circles) and post-surgically (small open circles) with animals on the treadmill. Values are means ± 1 S.D. (N=6).