(D) Genes with higher expression at different developmental stages were selected out from previously reported RNA-seq (Data ref: Bertone, 2015). "Mor", "ICM", "pre-EPI" and "post-EPI" represented genes that have high expression only in morula, inner cell mass, pre-implantation epiblast and post-implantation epiblast, respectively. "Mor+ICM", "ICM+pre", and "EPI" indicated genes that have high expression in both morula and inner cell mass, in both inner cell mass and pre-implantation epiblast, and in both pre-implantation and post-implantation epiblast, respectively. The results of previously reported RNA-seq were summarized in the left panel, while the expression of these genes in current RNA-seq was summarized in the right panel. Log2 values of FKPM were presented similarly as in (C). 