Gene expression profiling for lineage segregation during PED. (A) Venn diagram of co-expression genes in the morula and ICM (left), and in the morula and TE (right). Co-expression relationship for one gene is on both lists: 1) morula cells gene expression list (RPKM >3). 2) ICM cells specific gene expression list or TE cells gene expression list (RPKM >3). (B) Heat map of ICM and TE marker gene clustering (highly expressed genes are shown in yellow, and minimally expressed genes are shown in blue).