tokens: We report that both YY1 and LSF participate in the formation of a complex that recognizes the initiation region of the HIV-1 LTR .
folded_tokens: we report that both yy1 and lsf participate in the formation of a complex that recognizes the initiation region of the hiv-1 ltr .
labels: O O O O B-protein_molecule O B-protein_molecule O O O O O O O O O O O O O O B-virus O O