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Nair MP, Pottathil R, Heimer EP, Schwartz SA.Nair MP, et al. Among authors: schwartz sa.Proc Natl Acad Sci U S A. 1988 Sep;85(17):6498-502. doi: 10.1073/pnas.85.17.6498.Proc Natl Acad Sci U S A. 1988.PMID: 3045818Free PMC article.