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Alkaline phosphatase (ALP) activity measured at Day 14 in (a) MG63 cells cultured on phosphate‐based glass discs and tissue culture plastic (TCP) and (b) human mesenchymal stem cells cultured on phosphate‐based glass microspheres. Graphs show arbitrary units (a.u.) of optical density (O.D.). Error bars represent standard error of mean; n = 12
