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Sequence Analysis of the gp85 protein of ALV-J local chicken isolates. The variable domains (vr2, hrl, hr2, and vr3) are indicated in red boxes and marked. Twelve unique amino acid substitutions (SH18JY02, SH18JY01, and HB18XH01) in group IV are indicated in blue boxes. Abbreviation: ALV-J, Avian leukosis virus subgroup J.
