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sigma-70 family RNA polymerase sigma factor
sigma-70 family RNA polymerase sigma factor; sigma factors are initiation factors that promote the attachment of RNA polymerase to specific initiation sites and are then released
This model encompasses all varieties of the sigma-70 type sigma factors including the ECF subfamily. A number of sigma factors have names with a different number than 70 (i.e. sigma-38), but in fact, all except for the Sigma-54 family (TIGR02395) are included within this family. Several PFAM models hit segments of these sequences including Sigma-70 region 2 (PF04542) and Sigma-70, region 4 (PF04545), but not always above their respective trusted cutoffs.
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