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Figure 6 A, Vasa vasorum density between normal and balloon-injured coronary arteries. A significant increase in the density of vasa vasorum is present 28 d after balloon injury. B, Density ratio of first- (open bars) and second-order vasa vasorum (hatched bars) between normal and balloon-injured coronary arteries. Twenty-eight days after PTCA there was a shift in the ratio of first- to second-order vasa vasorum.