BL21 is a protease-deficient E. coli strain used for recombinant protein expression from non-T7 or host-polymerase-driven vectors. The cells are pr...

BL21(DE3) is a protease-deficient E. coli expression strain carrying the T7 RNA polymerase system for high-level production from T7-promoter vector...

BL21(DE3)pLysS is a T7 expression strain in which the pLysS plasmid suppresses basal T7 RNA polymerase activity, making it useful for tightly contr...

HB101 is an E. coli K-12/B hybrid strain used for routine cloning, plasmid propagation and maintenance of many standard vectors. The cells are prep...

The DH10B-derived cloning background is suited to high-complexity plasmid libraries, genomic or cDNA libraries and large constructs. The high-effic...

The DH5α-type 5-alpha background is intended for routine cloning, subcloning, plasmid propagation and blue-white screening. The cells are prepared ...

ccdB Resist cells permit propagation of Gateway and other vectors that contain the otherwise lethal ccdB gene. The cells are prepared for chemical ...

Stable 2 is an E. coli cloning strain optimized for unstable, repetitive or rearrangement-prone DNA, including retroviral or lentiviral sequences a...

XL1-Blue Max is a cloning strain used for routine and high-efficiency cloning, library construction, mutagenesis and blue-white screening. The cell...

ER2738 is an F-positive E. coli host used for M13 bacteriophage propagation and phage-display library screening. The cells are prepared for chemica...

JM109(DE3) combines the JM109 cloning background with a chromosomal T7 RNA polymerase system for expression from T7-promoter vectors. The cells are...

JM109 is a recA-deficient cloning strain used for plasmid propagation, subcloning and blue-white screening. The cells are prepared for chemical tra...

MG1655 is a well-characterized E. coli K-12 reference strain used in physiology, genetics and metabolic-engineering studies. The cells are prepared...