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Vetter ML, Martin-Zanca D, Parada LF, Bishop JM, Kaplan DR.Vetter ML, et al. Among authors: kaplan dr.Proc Natl Acad Sci U S A. 1991 Jul 1;88(13):5650-4. doi: 10.1073/pnas.88.13.5650.Proc Natl Acad Sci U S A. 1991.PMID: 1712104Free PMC article.