A mammalian blastula in which some differentiation of cells has occurred. Also called blastodermic vesicle.
- Many scientists believe blastocysts - stem cells taken from days-old embryos - have much greater potential.
- The fundamental question concerns the nature of the blastocyst from which stem cells are derived.
- Adult stem cells were injected into a mouse blastocyst, an early embryonic stage of a mouse.
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