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Morphology of P and PRT scaffolds degraded in vivo. (Scale bars: 50 μm in A and B, 10 μm in C and D. P: poly(d,l-lactic acid); PRT: poly(d,l-lactic acid)/RGD peptide modification of poly{(lactic acid)-co-[(glycolic acid) -alt-(l-lysine)]}/β-tricalcium phosphate)
