Much attention has recently focused on the observation that UV light can activate the long terminal repeat ( LTR ) of the human immunodeficiency virus ( HIV ) .
much attention has recently focused on the observation that uv light can activate the long terminal repeat ( ltr ) of the human immunodeficiency virus ( hiv ) .
O O O O O O O O O B-other_name I-other_name O O O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O B-DNA_domain_or_region O O O B-virus I-virus I-virus O B-virus O O