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Marsland BJ, Harris NL, Camberis M, Kopf M, Hook SM, Le Gros G.Marsland BJ, et al. Among authors: kopf m.Proc Natl Acad Sci U S A. 2004 Apr 20;101(16):6116-21. doi: 10.1073/pnas.0401582101. Epub 2004 Apr 12.Proc Natl Acad Sci U S A. 2004.PMID: 15079067Free PMC article.