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Scanning electron microscopy images of the electrospun fiber mats. (a, b) PDO fibers; (c) PDO-RGD fibers; (d) PU fibers; (e, f) PHBVV fibers. (applied voltage: 2.0 kV for PDO; 5.0 kV for PDO-RGD, PU, and PHBVV). PDO, polydioxanone; PU, polyurethane; RGD, arginine-glycine-aspartate.
