这个词是什么意思？
A group of hereditary hemolytic anemias in which there is decreased synthesis of one or more hemoglobin polypeptide chains. There are several genetic types with clinical pictures ranging from barely detectable hematologic abnormality to severe and fatal anemia.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D013789 · MeSH 2026。
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