blas·to·sphere /ˈblæstəsˌfɪ(ə)r/ 名詞
囊胚,囊胚泡
Blas·to·sphere n. Biol. The hollow globe or sphere formed by the arrangement of the blastomeres on the periphery of an impregnated ovum.
Note: [See Illust. of Invagination.]
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blastosphere
n : the blastula of mammals [syn: blastocyst]