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Large scale containment

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B. Pertussis (Cm R ) Cm R ptx (S2…S5)<br />

S1*<br />

pSS4245::S1*<br />

ptx promoter<br />

I-SceI gene<br />

I-SceI site<br />

Cointegrate (Str R , Cm R )<br />

Str R active in B. pertussis, NOT in E. coli<br />

Conjugative transfer, Str selection,<br />

ptx repression<br />

Str R<br />

ptx induction<br />

DSB<br />

Cm R<br />

Cm R (~50%)<br />

Resolution<br />

S1*, Cm S (~50%)<br />

ptx (S1*…S5)

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