这个词是什么意思？
Phylum in the domain Eukarya, comprised of animals either with fully developed backbones (VERTEBRATES), or those with notochords only during some developmental stage (CHORDATA, NONVERTEBRATE).
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D043344 · MeSH 2026。
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