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In page Sweat test:
"The concentration of sodium in sweat is also elevated in cystic fibrosis. Unlike CFTR chloride channels, sodium channels behave perfectly normally in cystic fibrosis. However, in order for the secretion to be electrically neutral, positively charged sodium cations remain in the sweat along with the negatively charged chloride anions. In this way, the chloride anions are said to "trap" the sodium cations.[citation needed]
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