HES3 and embryonal carcinoma: Antibody 2448 was found to specifically bind to HES-3 (hESC) and 2102Ep (embryonal carcinoma cells) but not on normal adult cell lines: HFF (human foreskin fibroblast), IMR90 (lung fetal fibroblast) and HEK293 (human embryonal kidney) (Supplementary Table 1).