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Chopra V, Fox JH, Lieberman G, Dorsey K, Matson W, Waldmeier P, Housman DE, Kazantsev A, Young AB, Hersch S.Chopra V, et al. Among authors: waldmeier p.Proc Natl Acad Sci U S A. 2007 Oct 16;104(42):16685-9. doi: 10.1073/pnas.0707842104. Epub 2007 Oct 9.Proc Natl Acad Sci U S A. 2007.PMID: 17925440Free PMC article.