tokens: The location of the IBS within the catB structural gene , the cooperativity observed in footprinting studies and phasing studies suggest that the IBS participates in the interaction of CatR with the upstream binding sites by looping out the intervening DNA .
folded_tokens: the location of the IBS within the catb structural gene , the cooperativity observe in footprinting study and phase study suggest that the IBS participate in the interaction of catr with the upstream binding site by loop out the intervene dna .