Germination.
Greek blastos, germ or sprout.
Examples include blastocyst, a mammalian blastula (an embryo at the early stage of development when it is a hollow ball of cells) in which some differentiation of cells has occurred; blastoderm (Greek derma, skin), a blastula having the form of a disc of cells on top of the yolk; and blastomere (Greek meros, part), a cell formed by cleavage of a fertilized ovum.
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