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....
Derivativeschorionic![]()
OriginMid 16th century: from Greek khorion. |
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