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Variation in nucleotide homology obtained by amplification, cloning and sequencing of complete S1 gene from field samples of avian infectious bronchitis virus. RITTERBUSCH, G. A. - HUBNER, S. O. - COSTA, C. - SILVA, A. D. da - TREVISOL, I. M. - KLEIN, T. A. P. - OKINO, C. H. - ESTEVES, P. A.
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