这个词是什么意思？
Represents 15-20% of the human serum immunoglobulins, mostly as the 4-chain polymer in humans or dimer in other mammals. Secretory IgA (IMMUNOGLOBULIN A, SECRETORY) is the main immunoglobulin in secretions.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D007070 · MeSH 2026。
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