 CRISPR-Cas system
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Restriction and modification system (R-M system)
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 Toxin-antitoxin system (TA system)
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Type I TA system
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Type II TA system
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MazF-MazE
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ChpB-ChpS
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YhaV-PrlF
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RelE/StbE-RelB/StbD
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YafQ-dinJ
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YoeB-YefM
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HipA-HipB
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HicA-HicB
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YafO-YafN
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PspC-PspB
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CcdB-CcdA
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ParE-ParD
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Doc-Phd
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HigB-HigA
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MqsR-MqsA
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VapC-VapB
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PezT-PezA
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YobL-YobK
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YokI-YokJ
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YqcG-YqcF
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YxiD-YxxD
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FitB-FitA
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BC_0920-BC_0921
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SpoIISA-SpoIISB
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Tse6-Tsi6
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Type II TA system related factors
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 K19334 tabA; biofilm protein TabA
K13650 mcbA; MqsR-controlled colanic acid and biofilm protein A
K12148 bssS; biofilm regulator BssS
K19688 bssR; biofilm regulator BssR
K12151 bhsA; multiple stress resistance protein BhsA
K03531 ftsZ; cell division protein FtsZ
K03569 mreB; rod shape-determining protein MreB and related proteins
K02621 parC; topoisomerase IV subunit A [EC:5.6.2.2]
K02622 parE; topoisomerase IV subunit B [EC:5.6.2.2]
K01885 EARS, gltX; glutamyl-tRNA synthetase [EC:6.1.1.17]
K07060 nob1; endoribonuclease Nob1 [EC:3.1.-.-]
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Type III TA system
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Type IV TA system
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YeeV-YeeU
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K18837 cbtA; cytoskeleton-binding toxin CbtA and related proteins
K18838 cbeA; cytoskeleton bundling-enhancing protein CbeA and related proteins
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CptA-CptB
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AbiEii-AbiEi
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Type V TA system
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Type VI TA system
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Type VII TA system
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Type VIII TA system
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DNA phosphothiolation system
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Prokaryotic Defense System