Wp is exclusively utilized during the initial stages of infection of primary B lymphocytes , followed by a switch to Cp usage .
wp is exclusively utilized during the initial stages of infection of primary b lymphocytes , followed by a switch to cp usage .
B-DNA_substructure O O O O O O O O B-other_name O B-cell_type I-cell_type I-cell_type O O O O O O B-DNA_domain_or_region O O