这个词是什么意思？
The major human blood type system which depends on the presence or absence of two antigens A and B. Type O occurs when neither A nor B is present and AB when both are present. A and B are genetic factors that determine the presence of enzymes for the synthesis of certain glycoproteins mainly in the red cell membrane.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D000017 · MeSH 2026。
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