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Duncan ID, Hammang JP, Trapp BD.Duncan ID, et al. Among authors: trapp bd.Proc Natl Acad Sci U S A. 1987 Sep;84(17):6287-91. doi: 10.1073/pnas.84.17.6287.Proc Natl Acad Sci U S A. 1987.PMID: 3476944Free PMC article.