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Up-regulation of ErbB1 and ErbB4 genes expression following treating the expanded blastocysts with melatonin. a Quantitative real-time PCR (qRT-PCR) analysis of ErbB1 mRNA. * P<0.05 vs. all groups. b Quantitative real-time PCR (qRT-PCR) analysis of ErbB4 mRNA.* P<0.05 vs. all groups; ** P<0.05 vs. the control and the melatonin-treated groups
