这个词是什么意思？
Stable elementary particles having the smallest known positive charge, found in the nuclei of all elements. The proton mass is less than that of a neutron. A proton is the nucleus of the light hydrogen atom, i.e., the hydrogen ion.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D011522 · MeSH 2026。
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