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Key amino acids in the hypervariable region of the VP2 polypeptide of infectious bursal disease virus (IBDV) strains
*GenBank accession number. A: alanine, D: aspartic acid, H: histidine, I: isoleucine, L: leucine, N: asparagine, P: proline, Q: glutamine, S: serine, T: threonine , V: valine.
