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(A) SEM micrographs of the three nHD scaffolds at 37 °C before and after degradation by collagenase; the scale bar is 100 μm. (B) The porosity of the three nHD scaffolds. (C) The percentage of residual weight for the three nHD scaffolds in vitro collagenase degradation test; * p < 0.05 compared with nHD-1 scaffolds.
