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(A, B) The MelanoDerm tissues were treated with hUCB-MSC-CM in the presence or absence of PD98059 for 18 days. Then, the image was captured (A). And the tissues were collected to measure total melanin contents (B). The data were obtained from least three independent experiments and values are presented as the means ± S.E.M. (n>3, * p<0.05).
