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A. (a) Schematic showing a single unit cell extracted from TPU-A, (b) SEM image showing the surface morphology of TPU-A and (c) NP cells adhesion on TPU-A. B. Live/dead assay of chondrocytes and NP cells at different point of time (green: live; red: dead; scale bar: 200 μm). C. CCK8 assay for proliferation of chondrocytes and NP cells. Error bars represent S.D., and significant differences were assessed with Student's t-test; *P < 0.05.
