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Abu-Soud HM, Stuehr DJ.Abu-Soud HM, et al.Proc Natl Acad Sci U S A. 1993 Nov 15;90(22):10769-72. doi: 10.1073/pnas.90.22.10769.Proc Natl Acad Sci U S A. 1993.PMID: 7504282Free PMC article.