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OPN expression is minimal in the cardiomyocytes from an elderly patient with left ventricular hypertrophy and papillary muscle infarct. In the elderly patient with left ventricular hypertrophy and papillary muscle infarct, OPN (white in A) is expressed in only a few number of MLC (green in C), and ACTA1 (red in C) positive cardiomyocytes (arrows). (D) is the merged panel. Scale bar = 50 μm.
