Passaging of the NPC cell line HK666 led to activation of expression of BZLF1 , which encodes Zta and loss of Qp function .
passaging of the npc cell line hk666 led to activation of expression of bzlf1 , which encodes zta and loss of qp function .
O O O B-cell_line I-cell_line I-cell_line I-cell_line O O O O O O B-DNA_domain_or_region O O O B-protein_molecule O O O B-DNA_domain_or_region O O