Figure 1.

Schematic representation of the domain and subdomain architecture present in the different groups of the σ⁷⁰ family. Regions that do not have a direct interaction with DNA appear as circles. Domains σ_1.1, core σ₂, σ₃ and σ₄ appear in orange, blue, green and yellow, respectively. Subdomains σ_1.2 and σ_NCR (non-conserved region), which are considered part of the σ₂ domain but are not conserved in all σ⁷⁰ family groups, are depicted in dark blue and gray, respectively, and indicated with a dotted line. The extent of the rest of the σ domains is indicated with solid lines.