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Ranjan A, Chitnis CE.Ranjan A, et al. Among authors: chitnis ce.Proc Natl Acad Sci U S A. 1999 Nov 23;96(24):14067-72. doi: 10.1073/pnas.96.24.14067.Proc Natl Acad Sci U S A. 1999.PMID: 10570199Free PMC article.