这个词是什么意思？
A growth from a pollen grain down into the flower style which allows two sperm to pass, one to the ovum within the ovule, and the other to the central cell of the ovule to produce endosperm of SEEDS.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D053205 · MeSH 2026。
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