tokens: We have previously shown that the presence of the CD4 cytoplasmic tail is critical for human immunodeficiency virus ( HIV ) -induced apoptosis ( J . Corbeil , M . Tremblay , and D . D . Richman , J . Exp . Med . 183 : 39-48 , 1996 ) .
folded_tokens: we have previously shown that the presence of the cd4 cytoplasmic tail is critical for human immunodeficiency virus ( hiv ) -induced apoptosis ( j . corbeil , m . tremblay , and d . d . richman , j . exp . med . 183 : 39-48 , 1996 ) .
labels: O O O O O O O O O B-protein_domain_or_region I-protein_domain_or_region I-protein_domain_or_region O O O B-virus I-virus I-virus O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O