【背景资料】:SSEA-1 specific antibody, MC-480, is reactive with Stage-Specific Embyronic Antigen-1, also an epitope referred to as Lewis X . SSEA-1 is expressed on murine and human germ cells, murine embryonic stem cells (ES) and murine embryonal carcinoma cells. Expression levels differ between mouse and human with decreasing expression upon differentiation in mice and increased expression upon differentiation in humans.