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Cell viability in various material extracts. (A) Fluorescence micrographs of LIVE/DEAD–stained osteoblasts after cultured in different extracts for 1 and 3 d. The red arrows indicate dead cells. (B) Cell viabilities of different groups at 1 and 3 d. (C) pH value and (D) Mg2+ concentration of extracts before and after cell culture for 1 and 3 d.
