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TUNEL staining of WT (left embryo in each panel) and MZspg (right embryo in each panel) embryos at distinct embryonic stages between 32 cells and 90%-epiboly. Embryos are shown in animal (left column) and lateral (right column) view. Pou5f1 deficient embryos show enhanced apoptosis, starting at 60%-epiboly, compared to WT (G-J).
