The production of human immunodeficiency virus type 1 ( HIV-1 ) progeny was followed in the U937 promonocytic cell line after stimulation either with retinoic acid or PMA , and in purified human monocytes and macrophages .
the production of human immunodeficiency virus type 1 ( hiv-1 ) progeny was followed in the u937 promonocytic cell line after stimulation either with retinoic acid or pma , and in purified human monocytes and macrophages .
O O O B-virus I-virus I-virus I-virus I-virus O B-virus O O O O O O B-cell_line I-cell_line I-cell_line I-cell_line O O O O B-other_organic_compound I-other_organic_compound O B-other_organic_compound O O O O O O O O O