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Rico-Hesse R, Weaver SC, de Siger J, Medina G, Salas RA.Rico-Hesse R, et al.Proc Natl Acad Sci U S A. 1995 Jun 6;92(12):5278-81. doi: 10.1073/pnas.92.12.5278.Proc Natl Acad Sci U S A. 1995.PMID: 7777497Free PMC article.