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Murine embryo development. Representative images of murine embryos at sequential time points in the murine embryo assay. a Day 2 (HCG + 48 h) embryo at 2 cell stage. b Cleavage stage (HCG + 72 h) embryo at the 6–8 cell stage C. Hatching blastocyst (HCG + 120 h). Images taken at ×20 with scale bar, 50 μm
