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Photographs of (a) S. aureus and (b) E. coli grown on PLA/PU/GO (3%) and PLA/PU/GO (5%) for 4 h, respectively; (c) Fluorescence microscopy image of MC3T3-E1 cells grown on the electrospun PLA/PU/GO (5%) nanofibers for 48 h at 37 °C. The magnification is 100× [84].
