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Representative SEM images of cells on the membranes after seeded for 1, 3, 5, and 7 days (a and b). The images show the adherence and morphology of the cells. (c) Cell proliferation on the membranes after seeded for 1, 3, 5, and 7 days. (d) ALP activity of hPDLSCs on membranes on day 7. (n = 3), *P < 0.05, **P < 0.01, ***P < 0.001.
