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| PR:P13445 | RNA polymerase sigma factor RpoS (Escherichia coli K-12) | | |  | | |
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| PR:P0DM81 | RNA polymerase sigma factor RpoS (Salmonella enterica subsp. enterica serovar Typhimurium str. LT2) | | |  | | |
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| PR:P06224 | RNA polymerase sigma factor SigA (Bacillus subtilis subsp. subtilis str. 168) | | |  | | |
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| PR:P0A0J0 | RNA polymerase sigma factor SigA (Staphylococcus aureus subsp. aureus NCTC 8325) | | |  | | |