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Cell proliferation rates on gelatin-induced osteogenic cell sheets (GCSs) and conventional osteogenic cell sheets (OCSs). The cell number for GCSs increased steeply even after day 3, whereas that for OCSs remained constant after day 3. Each point represents the mean ± standard deviation (SD). * and # a statistically significant difference compared to the cell number on day 0 and between GCSs and OCSs on each day, respectively (p < 0.05).
