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Roussel MF, Sherr CJ.Roussel MF, et al. Among authors: sherr cj.Proc Natl Acad Sci U S A. 1989 Oct;86(20):7924-7. doi: 10.1073/pnas.86.20.7924.Proc Natl Acad Sci U S A. 1989.PMID: 2554296Free PMC article.