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Sjölander A, Yamamoto K, Huber BE, Lapetina EG.Sjölander A, et al. Among authors: lapetina eg.Proc Natl Acad Sci U S A. 1991 Sep 15;88(18):7908-12. doi: 10.1073/pnas.88.18.7908.Proc Natl Acad Sci U S A. 1991.PMID: 1716764Free PMC article.