DH5α is the most popular E. coli strain for everyday cloning applications. It supports blue/white screening for easy selection of recombinant DNA with X-Gal. In addition, DH5α carries recA1 mutation that eliminates homologous recombination ensuring insert stability. It also carries endA1 mutations that greatly improve the quality of plasmid DNA and yield prepared from mini-prep. It is useful for the transformation of large plasmids and two-hybrid systems (up to 40 kb). Features Suitable for cloning with large plasmid and cDNA library construction, and also allows for blue-white colony screening. Applications Cloning and subcloning Scale-up application Blue/white screening Store at Genotype endA1 recA1 relA1 deoR gyrA96 nupG hsdR17(rk–, mk+) supE44 thi-1 Δ(lacZYA-argF)U169 Φ80 lacZΔM15 λ– F– Efficiency >1x108cfu/µg Item 100 µl/vial 10 vials Control Plasmid (pUC19) 5 μl (10-4μg/μl)   ***** This is a cold item. You are requires to select Overnight shipping for purchase this item! *****

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DH5α is the most popular E. coli strain for everyday cloning applications. It supports blue/white screening for easy selection of recombinant DNA with X-Gal. In addition, DH5α carries recA1 mutation that eliminates homologous recombination ensuring insert stability. It also carries endA1 mutations that greatly improve the quality of plasmid DNA and yield prepared from mini-prep. It is useful for the transformation of large plasmids and two-hybrid systems (up to 40 kb). Features Suitable for cloning with large plasmid and cDNA library construction, and also allows for blue-white colony screening. Applications Cloning and subcloning Scale-up application Blue/white screening Store at Genotype endA1 recA1 relA1 deoR gyrA96 nupG hsdR17(rk–, mk+) supE44 thi-1 Δ(lacZYA-argF)U169 Φ80 lacZΔM15 λ– F– Efficiency >1x108cfu/µg Item 100 µl/vial 10 vials Control Plasmid (pUC19) 5 μl (10-4μg/μl)   ***** This is a cold item. You are requires to select Overnight shipping for purchase this item! *****

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This strain provides high levels of protein expression. This strain carries the lambda DE3 lysogen, which expresses T7 RNA polymerase from the lacUV5 promoter by isopropyl-1-thio-ß-D-galactopyranoside (IPTG) induction. The transformation efficiency of BL-21 is usually low, so the 6 minute/ heat shock cold plating protocol is recommended if high efficiency is desired. Genotype F– ompT gal dcm lon hsdSB(rB– mB–) λ(DE3 [lacI lacUV5-T7 gene 1 ind1 sam7 nin5]) Features Lack of Lon and Omp proteases allows high-level protein expression and accumulation Easy gene induction Applications IPTG induced gene expression in E. coli Ideal for high-level expression of non-toxic recombinant protein expression using T7-based expression vectors Subcloning Store At: ***** Warning ! This product requires to select Overnight shipping. *****

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This strain provides high levels of protein expression. This strain carries the lambda DE3 lysogen, which expresses T7 RNA polymerase from the lacUV5 promoter by isopropyl-1-thio-ß-D-galactopyranoside (IPTG) induction. The transformation efficiency of BL-21 is usually low, so the 6 minute/ heat shock cold plating protocol is recommended if high efficiency is desired. Genotype F– ompT gal dcm lon hsdSB(rB– mB–) λ(DE3 [lacI lacUV5-T7 gene 1 ind1 sam7 nin5]) Features Lack of Lon and Omp proteases allows high-level protein expression and accumulation Easy gene induction Applications IPTG induced gene expression in E. coli Ideal for high-level expression of non-toxic recombinant protein expression using T7-based expression vectors Subcloning Store At: ***** Warning ! This product requires to select Overnight shipping. *****  

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GM2163 is an E. coli K12 strain, which is deficient in both dam and dcm genes, is suitable for the propagation of plasmid or cloned DNA to be cut with Dam or Dcm-sensitive restriction enzymes. This strain is not recommended as a host for primary cloning/ligation since the dam mutation can result in higher mutation rates and a reduction in the transformation efficiency. Features Chloramphenicol resistant Not suitable for blue/white screening Not recommended as a host for primary cloning/ligation Applications Propagation of plasmid-free of Dam and Dcm methylations Store At Genotype F–ara–14 leuB6 fhuA31 lacY1 tsx78 glnV44 galK2 galT22 mcrA dcm–6 hisG4 rfbD1 rpsL136 dam13::Tn9 xylA5 mtl–1 thi-1 mcrB1 hsdR2 ***** Warning ! This is cold item, product requires to select Overnight shipping! *****

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GM2163 is an E. coli K12 strain, which is deficient in both dam and dcm genes, is suitable for the propagation of plasmid or cloned DNA to be cut with Dam or Dcm-sensitive restriction enzymes. This strain is not recommended as a host for primary cloning/ligation since the dam mutation can result in higher mutation rates and a reduction in the transformation efficiency. Features Chloramphenicol resistant Not suitable for blue/white screening Not recommended as a host for primary cloning/ligation Applications Propagation of plasmid-free of Dam and Dcm methylations Store At Genotype F–ara–14 leuB6 fhuA31 lacY1 tsx78 glnV44 galK2 galT22 mcrA dcm–6 hisG4 rfbD1 rpsL136 dam13::Tn9 xylA5 mtl–1 thi-1 mcrB1 hsdR2 ***** Warning ! This is cold item, product requires to select Overnight shipping! *****

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A superior DH5a strain with a transformation efficiency similar to that of electroporation (~1010 cfu/ug) ! ECOS™ X can be utilized for applications which require very high transformation efficiencies, such as of genomic library construction . The “X” as shown in the name, stands for extreme, meaning this competent cell was designed to exceed and set new limitations! The “X” also represents “10” in Roman numeral; our new product aims to reach 1010 in its efficiency. Features Super high efficiency comparable to electro-competent cells One step, one tube, finish in 6 minutes Requires no costly electroporation equipment Applications Efficient transformation of products from routine TA cloning Transformation of minute amounts of PCR products Construction of a more representative gene library Store At Genotype endA1 recA1 relA1 deoR gyrA96 nupG hsdR17(rk–, mk+) supE44 thi-1 Δ(lacZYA-argF)U169 Φ80 lacZΔM15 λ– F–   Efficiency ~5 x 109cfu/µg   100 µl/vial 10 vials Control Plasmid (pUC19)   ***** This is a cold item. You are requires to select Overnight shipping for purchase this item! *****

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DH5α is the most popular E. coli strain for everyday cloning applications. It supports blue/white screening for easy selection of recombinant DNA with X-Gal. In addition, DH5α carries recA1 mutation that eliminates homologous recombination ensuring insert stability. It also carries endA1 mutations that greatly improve the quality of plasmid DNA and yield prepared from mini-prep. It is useful for the transformation of large plasmids and two-hybrid systems (up to 40 kb). Features Suitable for cloning with large plasmid and cDNA library construction, and also  allows for blue-white colony screening. Applications Cloning and subcloning Scale-up application Blue/white screening Store at Genotype endA1 recA1 relA1 deoR gyrA96 nupG hsdR17(rk–, mk+) ;supE44 thi-1 Δ(lacZYA-argF)U169 Φ80 lacZΔM15 λ– F– Efficiency >1x109cfu/µg Item 100 µl/vial 80 vials Control Plasmid (pUC19)   ***** Warning ! This is cold item, product requires to select Overnight shipping! *****

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