POU5F1 and neoplasm: The tumors derived from Oct4-GFP+ p53−/− BMDC cells were sarcoma-like with few PGC-like tumor cells detected and often accompanied by hepatic-like tissues (3/5 mice) and large tumor cells (2/5 mice) (Fig. 1h, Supplementary Fig. S1f, g), which were positive for Oct4 and DAZL (Supplementary Fig. S1g) resembling oocyte or early parthenogenetic preimplantation embryo in morphology and marker expression.