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The sequence comparison on the 3′UTR of the ALV-J strains. Blue box represents ALV isolates without 205-nt deletion; red box represents ALV isolates which include 127 bp deletions; green box represents isolates that include the 205-nt deletion; ● YZ9902, the stains in which 125 bp deletions were first appeared; ▲ ADOL-7501, the strains in which 205-nt deletions first appeared; ▪ ALV-J isolated from our lab. Abbreviation: ALV-J, avian leukosis virus subgroup J.
