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Kierek K, Watnick PI.Kierek K, et al. Among authors: watnick pi.Proc Natl Acad Sci U S A. 2003 Nov 25;100(24):14357-62. doi: 10.1073/pnas.2334614100. Epub 2003 Nov 12.Proc Natl Acad Sci U S A. 2003.PMID: 14614140Free PMC article.