Esam gene is preferentially expressed in the HSC fraction of E14.5 fetal liver. Microarray analyses comparing HSC-enriched and ELP-enriched populations were performed. Two independent tests depicted the Esam gene as preferentially expressed in the HSC-enriched population. Results are shown as relative expression levels of each gene comparing with that of Gapdh of which value is 100. Ratio was calculated by [HSC level]/[ELP level] in each gene. The relative expression levels of c-kit were also shown as internal quality controls.