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Cassuto E, West SC, Podell J, Howard-Flanders P.Cassuto E, et al.Nucleic Acids Res. 1981 Aug 25;9(16):4201-10. doi: 10.1093/nar/9.16.4201.Nucleic Acids Res. 1981.PMID: 7029464Free PMC article.
Cassuto E, Howard-Flanders P.Cassuto E, et al.Nucleic Acids Res. 1986 Feb 11;14(3):1149-57. doi: 10.1093/nar/14.3.1149.Nucleic Acids Res. 1986.PMID: 3513121Free PMC article.
West SC, Cassuto E, Howard-Flanders P.West SC, et al.Proc Natl Acad Sci U S A. 1981 Oct;78(10):6149-53. doi: 10.1073/pnas.78.10.6149.Proc Natl Acad Sci U S A. 1981.PMID: 6273854Free PMC article.