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Scanning electron microscopy (SEM) observations of nonfunctionalized PCL scaffolds consisting of nonwoven electrospun nanofibers (a), PCL functionalized with Ibuprofen (PCL/(Ibu)3, 50 μg/mL) (b), BMP-2 (PCL/(BMP-2)3, 200 ng/mL) (c), and BMP-2/Ibuprofen (PCL/(BMP-2)3/(Ibu)3) nanoreservoirs (d).
