Immunohistochemistry staining for (A) CD105 and (C) αSMA is quantified (B, D) for nanoparticle treated loaded limbs, vehicle treated loaded limbs, and non-loaded limbs. On day 3, treatment significantly reduced the number of CD105 positive blood vessels. By day 7, this resulted in a significant decrease in the number of αSMA positive blood vessels. Perfused vessels appear black, and arrows indicate positively stained vessels. Scale bar is 250 µm. *: p < 0.05 vs. Non-Loaded, †: p < 0.05 vs. Vehicle.