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Shepherd GM, Barres BA, Corey DP.Shepherd GM, et al. Among authors: corey dp.Proc Natl Acad Sci U S A. 1989 Jul;86(13):4973-7. doi: 10.1073/pnas.86.13.4973.Proc Natl Acad Sci U S A. 1989.PMID: 2662191Free PMC article.