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"Protactinium" is a descriptor in the National Library of Medicine's controlled vocabulary thesaurus, MeSH (Medical Subject Headings). Descriptors are arranged in a hierarchical structure, which enables searching at various levels of specificity.

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Protactinium. A radioactive element of the actinide group of metals. It has the atomic symbol Pa, atomic number 91, and atomic weight 231. It decays by alpha-emission.

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