Sequence variation in the long terminal repeat ( LTR ) region of HIV-1 was analyzed in viral isolates of 17 infected individuals .
sequence variation in the long terminal repeat ( ltr ) region of hiv-1 was analyzed in viral isolates of 17 infected individuals .
O O O O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region B-DNA_domain_or_region O O O B-virus O O O B-virus I-virus O O B-multi_cell I-multi_cell O