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Yund MA, King DS, Fristrom JW.Yund MA, et al. Among authors: fristrom jw.Proc Natl Acad Sci U S A. 1978 Dec;75(12):6039-43. doi: 10.1073/pnas.75.12.6039.Proc Natl Acad Sci U S A. 1978.PMID: 216009Free PMC article.