Researchers are exploring whether these ubiquitous fluorinated molecules might worsen infections or hamper vaccine effectiveness.
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Edited by Howard C. Berg, Harvard University, Cambridge, MA (received for review February 12, 2003)
↵‡ To whom correspondence should be addressed. E-mail: yuhai{at}us.ibm.com.
This paper was submitted directly (Track II) to the PNAS office.
Abbreviation: SB, Sourjik and Berg.
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