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Uckun FM, Ledbetter JA.Uckun FM, et al. Among authors: ledbetter ja.Proc Natl Acad Sci U S A. 1988 Nov;85(22):8603-7. doi: 10.1073/pnas.85.22.8603.Proc Natl Acad Sci U S A. 1988.PMID: 2460871Free PMC article.