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Exercise induces increased intracellular Ca2+ levels. (A) Representative fluorescence imaging of isolated plantaris and soleus muscles from pCAGGS-GCaMP2 mice before and after exercise. Scale bar: 1 mm. (B) Quantitative analysis of GCaMP2 signal intensity (n > 4). Plantaris and soleus muscles were isolated before or immediately, 0.5, 1 and 3 h after exercise. Error bars indicate S.E.M.
