tokens: Mutations in the tat gene have been shown to block HIV replication in human T cells .
folded_tokens: mutations in the tat gene have been shown to block hiv replication in human t cells .
labels: O O O B-DNA_domain_or_region I-DNA_domain_or_region O O O O O B-other_name I-other_name O B-cell_type I-cell_type I-cell_type O