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| PR:P42175 | nitrate reductase alpha chain (Bacillus subtilis subsp. subtilis str. 168) | | |  | | |
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| PR:Q8YBF0 | nitrate reductase alpha chain (Brucella melitensis bv. 1 str. 16M) | | |  | | |
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| PR:A0A0H3G6Q9 | nitrate reductase, alpha subunit (Brucella suis 1330) | | |  | | |
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| PR:Q2YJY4 | nitrate reductase, alpha subunit:Prokaryotic molybdopterin oxidoreductase:Molybdopterin oxidoreductase:Molydopterin dinucleot (Brucella abortus 2308) | | |  | | |