Immunocytochemical analysis. Three clones were analyzed with immunocytochemistry for pluripotency. Clone 9 shows that it expresses the pluripotency markers OCT4 (A) and SSEA-4 (B), 4′,6-diamidino-2-phenylindole (DAPI) (C). The clone also expresses SOX2 (D) and TRA-1–60 (E), DAPI (F). The pluripotency transcription factor Nanog is expressed as well (G), DAPI (H). Scale bars, 10 μm. OCT4, octamer-binding transcription factor 4; SOX2, (sex-determining region Y)-box 2; SSEA-4, stage-specific embryonic antigen 4; TRA-1–60, tumor rejection antigen 1–60.