FACS analysis for stem cells markers. By FACS analysis, the following stem cell markers were found in these cells: oct-4, bone morphogenetic protein–4 (bmp-4), stage-specific embryonic antigen-4 (ssea-4), and c-kit. Other stem cell markers such as tra-1-60, tra-1-81, and stage-specific embryonic antigen-1 (ssea-1) were not identified in these cells.