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Fearon DT, Austen KF.Fearon DT, et al.Proc Natl Acad Sci U S A. 1975 Aug;72(8):3220-4. doi: 10.1073/pnas.72.8.3220.Proc Natl Acad Sci U S A. 1975.PMID: 1059108Free PMC article.