For the final design, in the second state of the Kill-switch the fusaric acid inducible promoter is active upon F. oxysporum recognition. However, because the fusaric acid promoter was not yet avalible we replaced the fusaric acid inducible promoter by a rhamnose inducible promoter and pRha. When pRha is induced by rhamnose, repressor CIλ is expressed, switching the circuit to its second state therefore CIλ represses pCIλ/Tet and pCIλ/Lac. This leads to a switch within the toggle switch. TetR can no longer repress pTet, therefore LacI is expressed, keeping the toggle switch in its final state, in which TetR is no longer expressed.