ACH-2 , derived from a human T cell line ( CEM ) , is chronically infected with HIV-1 , with low levels of constitutive virus expression .
ach-2 , derived from a human t cell line ( cem ) , is chronically infected with hiv-1 , with low levels of constitutive virus expression .
B-cell_line O O O O B-cell_line I-cell_line I-cell_line I-cell_line O B-cell_line O O O O O O B-virus O O O O O B-other_name I-other_name I-other_name O