这个词是什么意思？
A highly vascularized extra-embryonic membrane, formed by the fusion of the CHORION and the ALLANTOIS. It is mostly found in BIRDS and REPTILES. It serves as a model for studying tumor or cell biology, such as angiogenesis and TISSUE TRANSPLANTATION.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D049033 · MeSH 2026。
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