The Tet system we developed is similar to the Lac system. The pTet promoter which controls mtrB expression is regulated by the repressor TetR ([http://partsregistry.org/wiki/index.php?title=Part:BBa_C0040| BBa_C0040]). Expression of mtrB occurs when the system is induced with anhydrotetracycline which binds TetR.
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