这个词是什么意思？
The major immunoglobulin isotype class in normal human serum. There are several isotype subclasses of IgG, for example, IgG1, IgG2A, and IgG2B.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D007074 · MeSH 2026。
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