Figure 1.

DNA constructs used. Name and overall length are indicated next to each fragment. The length of the different parts of the fragments is indicated below the first and last fragment. The biotin (BIO) and digoxigenin (DIG) labels used to anchor the DNA molecules to the glass and bead surfaces are indicated at each end of the fragments. P_L and P_R are the two lytic promoters, while P_RM is the promoter for cI transcription. The rectangular, shaded boxes on the DNA indicate the operators where CI binds specifically. The white boxes indicate the mutated operators.