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Figure 7 A, Linear regression analysis between percentage lumen stenosis and density of vasa vasorum in porcine coronary arteries after PTCA (n = 32, r = 0.81, p < 0.0001). B, Percentage lumen stenosis and the corresponding density of vasa vasorum along the entire length of a single coronary segment. In this example, as the stenosis severity increased, so did the vasa vasorum density (r = 0.88, p = 0.0001).