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(a) Representative examples of staining of α-actin (×400) and macrophages (Mac3, ×100; scale bar: 200 μm) of the infarcted region 15 days after MI, and quantitative fractional areas of (b) macrophages and (c) neutrophils from day 1 to day 7 after MI. AP < 0.05. (d) α-actin fractional area at day 15.
