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Coen DM, Kosz-Vnenchak M, Jacobson JG, Leib DA, Bogard CL, Schaffer PA, Tyler KL, Knipe DM.Coen DM, et al. Among authors: schaffer pa.Proc Natl Acad Sci U S A. 1989 Jun;86(12):4736-40. doi: 10.1073/pnas.86.12.4736.Proc Natl Acad Sci U S A. 1989.PMID: 2543985Free PMC article.
Leib DA, Nadeau KC, Rundle SA, Schaffer PA.Leib DA, et al. Among authors: schaffer pa.Proc Natl Acad Sci U S A. 1991 Jan 1;88(1):48-52. doi: 10.1073/pnas.88.1.48.Proc Natl Acad Sci U S A. 1991.PMID: 1846042Free PMC article.
Coen DM, Schaffer PA.Coen DM, et al. Among authors: schaffer pa.Proc Natl Acad Sci U S A. 1980 Apr;77(4):2265-9. doi: 10.1073/pnas.77.4.2265.Proc Natl Acad Sci U S A. 1980.PMID: 6246531Free PMC article.