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To assess the status of avian leukosis virus subgroup J (ALV-J) infection in passerine birds in China, 365 passerine birds collected from northeast China from 2011 to 2013 were tested, and two ALV-J strains were isolated from yellow-browed warbler and marsh tit. The 3′untranslated regions (3′UTRs) of the two strains were amplified, cloned, and sequenced, with the results showing that the 3′UTRs of...
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