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a: Representative chromatogram of tyrosine standard. b: Representative chromatogram of muscle sample. c: Total protein proteolytic rate of the soleus muscle in ground squirrels from pre-hibernation, 60-d and post-hibernation groups. Values are means ± SEM, n = 6 in each group. **P < 0.01 and *** P < 0.001 versus pre-hibernation group. ###P < 0.001 versus hibernation group
