...allow you to insert and induce your gene of interest. ID Plasmid Description Co-expressed tTA, rtTA, or TetR...expresses the transactivator for your tetraycline system. ID Plasmid Description Element On or off PI 26429 pLenti...expression. Several endogenous promoters had been identified that responded to stimuli, such as hormones or... lac system with the inducer isopropylthio-β-galactoside (IPTG) was tested first, but IPTG was found to... Element (TRE) A TRE is seven repeats of a 19 nucleotide tetracycline operator (tetO) sequence, and is...domain, resulting in reduced gene expression. This idea of a hybrid transactivator was initially used with...1995, Gossen et al. used random mutagenesis to identify which amino acid residues of tetR were important...