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Scanning electron microscopy (SEM) and cell counting kit-8 (CCK-8) assays of NIH3T3 (a) and MC3T3 (b) cells on collagen, PCL, and PCL/β-TCP membranes showing that attached cells grew well. (*** p < 0.001, ** p < 0.01, * p < 0.05, NS = No significant difference).
