tokens: Human T-cell leukemia virus type 1 ( HTLV-1 ) is an etiological agent of adult T-cell leukemia ( ATL ) .
folded_tokens: human t-cell leukemia virus type 1 ( htlv-1 ) is an etiological agent of adult t-cell leukemia ( atl ) .
labels: B-virus I-virus I-virus I-virus I-virus I-virus O B-virus O O O O O O B-other_name I-other_name I-other_name O B-other_name O O