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Flores M, Brom S, Stepkowski T, Girard ML, Dávila G, Romero D, Palacios R.Flores M, et al. Among authors: romero d.Proc Natl Acad Sci U S A. 1993 Jun 1;90(11):4932-6. doi: 10.1073/pnas.90.11.4932.Proc Natl Acad Sci U S A. 1993.PMID: 8506337Free PMC article.