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Phylogenetic tree showing the old (current) and new (proposed) classification of families (left) and genera (right) in the order Nidovirales. 13 The tree was inferred by maximum likelihood using concatenated multiple sequence alignments of 3CLpro, NiRAN, RdRp, ZBD and HEL1 domains. The blue arrow depicts the position of IBV. Adapted from Siddell et al. 13
