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Humphrey PA, Wong AJ, Vogelstein B, Zalutsky MR, Fuller GN, Archer GE, Friedman HS, Kwatra MM, Bigner SH, Bigner DD.Humphrey PA, et al.Proc Natl Acad Sci U S A. 1990 Jun;87(11):4207-11. doi: 10.1073/pnas.87.11.4207.Proc Natl Acad Sci U S A. 1990.PMID: 1693434Free PMC article.
Wong AJ, Ruppert JM, Bigner SH, Grzeschik CH, Humphrey PA, Bigner DS, Vogelstein B.Wong AJ, et al. Among authors: humphrey pa.Proc Natl Acad Sci U S A. 1992 Apr 1;89(7):2965-9. doi: 10.1073/pnas.89.7.2965.Proc Natl Acad Sci U S A. 1992.PMID: 1557402Free PMC article.