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Effect of physiologic concentration of melatonin on the viability of adipose-derived stem cells. The cells were plated at 10 × 105 cells/well and cultured in osteogenic medium with or without physiologic concentration of melatonin for 28 days. Cell viability was measured by MTT assay on 14th, 28th days. The osteogenic medium alone group was the control group. Values are mean ± SE (n = 3) (*P < 0.05). Cont: control, lM: melatonin 0.01 nM, hM: melatonin 10 nM
