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Morrison SJ, Hemmati HD, Wandycz AM, Weissman IL.Morrison SJ, et al.Proc Natl Acad Sci U S A. 1995 Oct 24;92(22):10302-6. doi: 10.1073/pnas.92.22.10302.Proc Natl Acad Sci U S A. 1995.PMID: 7479772Free PMC article.
Morrison SJ, Wright DE, Weissman IL.Morrison SJ, et al.Proc Natl Acad Sci U S A. 1997 Mar 4;94(5):1908-13. doi: 10.1073/pnas.94.5.1908.Proc Natl Acad Sci U S A. 1997.PMID: 9050878Free PMC article.