Figure 4.

Representation of four of the conjugated single-Cys mutants and their cut sites on the core subunits, by using the crystal structure of a σ⁷⁰ fragment (23). Conserved regions of σ⁷⁰ are indicated. Regions: 1.2, red; 2.1, green; 2.2, yellow; 2.3, cyan; 2.4, orange.