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Trapp BD, McIntyre LJ, Quarles RH, Sternberger NH, Webster HD.Trapp BD, et al.Proc Natl Acad Sci U S A. 1979 Jul;76(7):3552-6. doi: 10.1073/pnas.76.7.3552.Proc Natl Acad Sci U S A. 1979.PMID: 291024Free PMC article.