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OD values of NC (control group), Mg (10 mM Mg2+ group), COL (Col I-coating group), Mg+COL (10 mM Mg2+/Col I-coating group) after incubation of MC3T3-E1 cells for 1, 3 and 5 days. One-way ANOVA (n = 5 per treatment group). *P < 0.05 versus control group
