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| PR:P50546 | DNA-directed RNA polymerase subunit beta (Arabidopsis thaliana) | | |  | | |
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| PR:Q59191 | DNA-directed RNA polymerase subunit beta (Borreliella burgdorferi B31) | | |  | | |
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| PR:Q2YM15 | DNA-directed RNA polymerase subunit beta (Brucella abortus 2308) | | |  | | |
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| PR:Q57CP8 | DNA-directed RNA polymerase subunit beta (Brucella abortus bv. 1 str. 9-941) | | |  | | |
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| PR:A9M5R0 | DNA-directed RNA polymerase subunit beta (Brucella canis ATCC 23365) | | |  | | |
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| PR:C0RJL1 | DNA-directed RNA polymerase subunit beta (Brucella melitensis ATCC 23457) | | |  | | |
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| PR:A5VR15 | DNA-directed RNA polymerase subunit beta (Brucella ovis ATCC 25840) | | |  | | |
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| PR:Q8G069 | DNA-directed RNA polymerase subunit beta (Brucella suis 1330) | | |  | | |
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| PR:B0CH41 | DNA-directed RNA polymerase subunit beta (Brucella suis ATCC 23445) | | |  | | |
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| PR:A5I7L4 | DNA-directed RNA polymerase subunit beta (Clostridium botulinum A str. Hall) | | |  | | |
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| PR:P0A8V2 | DNA-directed RNA polymerase subunit beta (Escherichia coli K-12) | | |  | | |
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| PR:P0A8V2-1 | DNA-directed RNA polymerase subunit beta isoform 1 (Escherichia coli K-12) | | |  | | |
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| PR:000036752 | DNA-directed RNA polymerase subunit beta isoform 1 acetylated 1 (Escherichia coli K-12) | | |  | | |
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| PR:Q18CF1 | DNA-directed RNA polymerase subunit beta (Peptoclostridium difficile 630) | | |  | | |
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| PR:Q8RQE9 | DNA-directed RNA polymerase subunit beta (Thermus thermophilus HB8) | | |  | | |
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| PR:000025213 | DNA-directed RNA polymerase subunit beta isoform 1 | | |  | | |
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| PR:P0A8V2-1 | DNA-directed RNA polymerase subunit beta isoform 1 (Escherichia coli K-12) | | |  | | |
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| PR:000036752 | DNA-directed RNA polymerase subunit beta isoform 1 acetylated 1 (Escherichia coli K-12) | | |  | | |
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| PR:000025216 | DNA-directed RNA polymerase subunit beta isoform 1 acetylated 1 | | |  | | |
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| PR:000036752 | DNA-directed RNA polymerase subunit beta isoform 1 acetylated 1 (Escherichia coli K-12) | | |  | | |
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| PR:000025214 | DNA-directed RNA polymerase subunit beta isoform 1 unmodified form | | |  | | |