单词	chorion
释义	chorion /ˈkɔːrɪən / noun Embryology The outermost membrane surrounding an embryo of a reptile, bird, or mammal. In mammals it contributes to the formation of the placenta.In insects, the genes that encode the proteins of the egg membrane, the chorion, become amplified in the surrounding follicle cells.... A needle was used to roll the embryo out of the chorion. Care was exercised not to separate the amniotic sac into its components, the chorion and amnion. Derivatives chorionic /ˌkɒrɪˈɒnɪk / adjective ... Amniotic fluid, chorionic villi, or fetal serum can be tested for evidence of West Nile virus infection. Triple screening should not replace amniocentesis or chorionic villous sampling in pregnancies at high risk for trisomy 21. These authors found ultrastructural evidence of altered endothelial and smooth muscle cells within chorionic vessels exhibiting HEV-like lesions. Origin Mid 16th century: from Greek khorion.
随便看	penny wise and pound foolish penny-wise-pound-foolishness pennywort pennyworth Penobscot Penobscot River penologic penological penologist penology penoscrotal pen pal penpalship pen-picture pen plume penpoint pen pond pen portrait pen-pusher pen-pushing pen-record pen recorder pen recording Penrose diagram penroseite

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