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Rapp JC, Krug LT, Inoue N, Dambaugh TR, Pellett PE.Rapp JC, et al. Among authors: dambaugh tr.Virology. 2000 Mar 15;268(2):504-16. doi: 10.1006/viro.1999.0163.Virology. 2000.PMID: 10704358Free article.