Sigma3 and sigma4 domains of RNA polymerase sigma factors (7 domains)
Class (a): All alpha proteins [46456]
Fold (a.4): DNA/RNA-binding 3-helical bundle [46688]
Superfamily (a.4.13): Sigma3 and sigma4 domains of RNA polymerase sigma factors [88659]
Family (a.4.13.1): Sigma3 domain [88660]
Family (a.4.13.2): Sigma4 domain [88665]
Family (a.4.13.3): YlxM/p13-like [109706]
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