Abstract
Distribution of the stage-specific embryonic antigen (SSEA-1) was studied in postimplantation murine embryos, fetuses, and adult mice by immunohistochemical techniques. SSEA-1 was also localized on the stem cells of differentiating solid teratocarcinomas and on the surface of core cells of solid embryoid bodies. At the egg cylinder stage the antigen is restricted to embryonic ectoderm and visceral endoderm. During subsequent development SSEA-1 becomes localized to portions of the brain and primordial germ cells. In addition some sites of the urogenital anlage are SSEA-1 positive. In adult mice, the epithelium of the oviduct, the endometrium, and the epididymis are the cells most reactive with the monoclonal antibody to SSEA-1; although some areas of the brain and kidney tubules are weakly positive. Study of this antigenic determinant might disclose some previously unexpected cell lineage relationships and/or might elucidate events necessary for reproduction.
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