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Stevenson PG, Efstathiou S, Doherty PC, Lehner PJ.Stevenson PG, et al.Proc Natl Acad Sci U S A. 2000 Jul 18;97(15):8455-60. doi: 10.1073/pnas.150240097.Proc Natl Acad Sci U S A. 2000.PMID: 10890918Free PMC article.
Stevenson PG, Belz GT, Altman JD, Doherty PC.Stevenson PG, et al.Proc Natl Acad Sci U S A. 1998 Dec 22;95(26):15565-70. doi: 10.1073/pnas.95.26.15565.Proc Natl Acad Sci U S A. 1998.PMID: 9861009Free PMC article.
Stevenson PG, Belz GT, Castrucci MR, Altman JD, Doherty PC.Stevenson PG, et al.Proc Natl Acad Sci U S A. 1999 Aug 3;96(16):9281-6. doi: 10.1073/pnas.96.16.9281.Proc Natl Acad Sci U S A. 1999.PMID: 10430934Free PMC article.