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Fiber type composition of soleus muscle is not altered by GRK2 ablation. A, muscle fiber type immunostaining of soleus cross-sections from GRK2fl/fl and MLC-Cre:GRK2fl/fl mice. Separate myosin heavy chain (MyHC) isoforms were immunostained in sequential sections. Scale = 100 μm. B, graphs depict the mean percentage contribution of each fiber type to the make-up of the entire muscle section, and error bars represent S.D.; n = 3 mice per group.
