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A. Immunohistochemical staining of cardiac β1-AR. Scale bar = 100 microns. B. Negative staining control. C–D. The expression of cardiac β1-AR in the SC, MI, ME groups. Immunohistochemical staining and Western blot analysis indicated that the protein expression of β1-AR in the left ventricle was significantly reduced after MI. Aerobic exercise was able to increase the expression of β1-AR.
