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Embryos collected 6 days after the onset of estrus. (A) Compacted morulae. (B) Full blastocysts. (C–E) Expanded, hatching and hatched blastocysts, respectively. (F) Degenerated embryos. Note that most of the embryos have a developmental stage that is inappropriate for the day of the collection. Inset shows some unfertilized oocytes.
