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Stage-specific embryonic antigen 1 (SSEA1) analyzed by FACS in mouse embryonic stem (ES) cells (A, B) and zebrafish blastomeres (C, D). Positive cells are present inside the marked area. Negative controls show no positive cells inside the area (A, C). Mouse ES cells are SSEA positive (B), but zebrafish blastomeres are negative (D). Color images available online at www.liebertonline.com/zeb
