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Gene expression as a correlate of osteogenic differentiation during the incubation period (D7-D21). RUNX2 (a, d) as a marker of early osteogenic differentiation. OPN (b, e) and OCN (c, f) as markers of mature osteoblasts. Values are normalized to the control group (indicated by the dotted line) and shown as means with standard deviation. (*) indicates significant difference.
