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ME trees of the N gene and protein of IBVs. Both genes (A, C, and E) and their encoded proteins (B, D, and F) are illustrated. full-length, nt 1–1230 (A) and aa 1–409 (B); N-terminus, nt 1–600 (C) and aa 1–200 (D); C-terminus, nt 601–1230 (E) and aa 201–409 (F). The scale bars correspond to the number of nucleotide replacements per site.
