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Viguera AR, Vega C, Serrano L.Viguera AR, et al. Among authors: serrano l.Proc Natl Acad Sci U S A. 2002 Apr 16;99(8):5349-54. doi: 10.1073/pnas.072387799.Proc Natl Acad Sci U S A. 2002.PMID: 11959988Free PMC article.