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Known interactions among repair proteins as detected by the bacterial two-hybrid assay. The T18 and T25 subunits of CyaA are fused to any two repair proteins (illustrated here by MutL and Vsr), allowing measurement of all pairwise interactions as units of β-galactosidase (β-gal). T25 fusions are repair proficient. CRP, cyclic AMP (cAMP) receptor protein; P, lac operon promoter; RNAP, RNA polymerase.
