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Wagner GF, Guiraudon CC, Milliken C, Copp DH.Wagner GF, et al.Proc Natl Acad Sci U S A. 1995 Mar 14;92(6):1871-5. doi: 10.1073/pnas.92.6.1871.Proc Natl Acad Sci U S A. 1995.PMID: 7892193Free PMC article.