Scanning electron microscopy images of the nanofibrous scaffolds. (a) C1 scaffold (PCL scaffold functionalized with maximum platelet concentration, scale bar 20 μm, magnification 4000×). (b) C2 scaffold (PCL with half the maximum platelet concentration, scale 20 μm, magnification 4000×), (c) C3 scaffold (PCL with quarter the maximum platelet concentration, scale bar 20 μm, magnification 4000×). (d) PCL control scaffold (scale bar 20 μm, magnification 2940×)