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nounearly stage of an embryo produced by cleavage of an ovum; a liquid-filled sphere whose wall is composed of a single layer of cells; during this stage (about eight days after fertilization) implantation in the wall of the uterus occurs
Similar:
type of:
Parts of blastosphere
- "blastocele"
- "trophoblast"
- "blastocoel"
- "blastocoele"
- "cleavage cavity"
- "segmentation cavity"