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Kaplan–Meier survival curves and Gehan-Breslow-Wilcoxon test for overall survival of melanoma patients stratified by positive and negative MTNR1A mRNA expression (A), positive and negative MTNR1B mRNA expression (B), low and high MTNR1A mRNA expression (C), low and high MTNR1B mRNA expression (D) as described in Materials and Methods.
