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A-H, Double immunostaining of β-Gal and CD31 (A, B, E, F) or SMA (C, D, G, H) in normal and ischemic heart (A–D) or skeletal muscle (E–H) sections of LacZ-tagged Flt-1 mice revealed labeling of Flt-1 expressing cells in most CD31+ cells (arrowheads) and in all SMA+ cells (arrows). Scale bars: 50 μm.
