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| PR:Q2YIT7 | type IV secretion system protein virB3 (Brucella abortus 2308) | | |  | | |
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| PR:P0C526 | type IV secretion system protein virB3 (Brucella abortus bv. 1 str. 9-941) | | |  | | |
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| PR:Q9RPY2 | type IV secretion system protein virB3 (Brucella melitensis bv. 1 str. 16M) | | |  | | |
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| PR:Q7CEG1 | type IV secretion system protein virB3 (Brucella suis 1330) | | |  | | |