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From 2012.igem.org

Biobricks

Single Population Toggle Switch - <a href="http://partsregistry.org/Part:BBa_K876001">BBa_K876001</a>
A mechanism that will lock into one of two different states when induced with the chemicals IPTG or ATc.

IPTG Binding Tester - <a href="http://partsregistry.org/Part:BBa_K876005">BBa_K876005</a>
A device that tests the ability of IPTG to bind and inhibit LacI

ATc Binding Tester - <a href="http://partsregistry.org/Part:BBa_K876004">BBa_K876004</a>
A device that tests the ability of ATc to bind and inhibit TetR