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Proliferation of cells cultured in different media. Cells were cultured in GM, IM, and CM for 14 days. At each time point, cell number was determined using CCK-8 cell proliferation/cell viability kit. The amount of cells would be proportional to the absorbance at 450 nm. The results were presented as the means ± standard deviation (n = 6). *Significant difference (P < 0.05) between groups at same time point.
