HI-CONTROL BL21/DE3 COMP CELLSInduce high level protein expression from T7 promoters with tight control over leaky expression, using this strain containing a LacI repressor. Competent Cells include Control DNA and Recovery Medium, and are packaged as SOLOs (1 transformation per tube). Recovery Medium is also available separately. The specified transformation efficiencies are with pUC DNA, unless indicated otherwise. Key features Reduce leaky expression: The LacI repressor protein