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Beheregaray LB, Gibbs JP, Havill N, Fritts TH, Powell JR, Caccone A.Beheregaray LB, et al. Among authors: powell jr.Proc Natl Acad Sci U S A. 2004 Apr 27;101(17):6514-9. doi: 10.1073/pnas.0400393101. Epub 2004 Apr 14.Proc Natl Acad Sci U S A. 2004.PMID: 15084743Free PMC article.