DNase I footprint of CRP (CAP) and lac repressor
with lac promoter DNA.
Lane a: Sequence ladder. Lane b: No DNA-binding proteins added.
Lane c: CRP (CAP) only. Lane g: Repressor only. Lanes d,
e, and f: CRP (CAP) and repressor both added.
Science 274, 1930-1931 (1997)