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Neighbor-joining tree of the Greek CCoV-IIa strains, based on the N-terminus of the S protein. The tree is rooted on the Betacoronavirus canine respiratory coronavirus (CRCoV). The numbers represent the percentage of replicate trees based on 1000 bootstrap replicates. The scale bar represents the number of amino acid substitutions per site. The divergent strain ED/99/08/IIa/GR is highlighted with a circle.
