Fig. 5From: Heparinized chitosan/hydroxyapatite scaffolds stimulate angiogenesisScaffolds stained with Toluidine blue; it is possible to observe the change from blue to purple in the presence of heparin. Loading concentrations: (a) No heparin, (b) 0.5 mg/mL, (c) 1 mg/mL, (d) 2 mg/mL, (e) 5 mg/mLBack to article page