HI-Control BL21(DE3) Chemically Competent Cells
Induce high-level protein expression from T7 promoters with tight control over leaky expression, using this strain containing a LacI repressor.
Induce high-level protein expression from T7 promoters with tight control over leaky expression, using this strain containing a LacI repressor.
Express difficult or toxic proteins using standard E. coli T7 expression vectors using these unique strains. Also available in chemically competent format.
Express difficult or toxic proteins using standard E. coli T7 expression vectors using these unique strains. Some strains also available in electrocompetent format.
Get better colony counts for routine protein expression with any E. coli T7 expression vector, with this high-efficiency BL21(DE3) strain.
LGC, Biosearch Technologies offers the best performance, value, and convenience in competent cells for cloning and expression. Our chemically competent cells offer an unmatched value for routine cloning, and our electrocompetent cells provide the highest possible efficiency for difficult cloning and library construction.
See our Custom Competent Cell Services page to learn how you can receive the high-quality cells in the exact format you need, when you need them. Custom dispensing is available in tubes or 96-well plates, for your strain or ours.
Our competent cells must pass strict QC specifications for transformation efficiency and antibiotic resistance.
Every lot of cells is tested to ensure the cells meet our guaranteed transformation efficiencies. Cells are also tested for resistance to a panel of antibiotics by plating mock-transformed cells on antibiotic plates. Common antibiotic panel includes: kanamycin, carbenicillin (ampicillin), streptomycin, tetracycline, gentamycin and chloramphenicol.
Chemically competent cells | Electrocompetent cells |
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Europe, Middle East, and Africa | |
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UK | +44 1992 470 757 |
Germany | +49 30 5304 2200 |
North America, Latin America | |
Wisconsin, USA | +1 888 575 9695 |
Asia Pacific | |
China | +8621-22509000 |
Singapore | +65 6734 4800 |