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Proliferation and viabilities of MC3T3-E1 cell cultured on the sample surfaces (a) (*P < 0.05, **P < 0.01, ***P < 0.001, ****P < 0.0001; all the data are expressed as the means ± SD and n = 3); the activity of ALP of the MC3T3-E1 cell cultured on various sample surfaces for 7 days and 14 days at low and high magnifications (b)
