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Cloning & Competent Cells

Products >  Cloning_and_Competent_Cells >  Competent_Cells >  Chemically_Competent_Cells

Chemically Competent Cells—High Efficiency Competent Cells for Cloning

An E. coli HST08 strain that provides high transformation efficiency. These cells can be used in a wide variety of applications—from preparation of cDNA and genomic libraries, to construction of longer-length genomic libraries, subcloning, and even methylated DNA cloning. Stellar Competent Cells lack the gene cluster for cutting foreign methylated DNA (mrr-hsdRMS-mcrBC and mcrA), and are therefore useful for cloning methylated DNA. The cells can also be used for blue/white screening (i.e., alpha-complementation) when transformed with vectors containing the lacZalpha gene. Stellar Competent Cells are ideal for use with Clontech's In-Fusion Cloning Kits.

Stellar Competent Cells (dam/dcm)

An E. coli HST04 strain that lacks the genetic factors (dam and dcm) necessary for the methylation of DNA. Plasmids prepared using this product can be cut by restriction enzymes which are normally blocked by dam or dcm methylation. A dam/recA double mutation is lethal, so the parent strain is recA+. Therefore, it follows that transformation of extracellular DNA with repeat sequences can result in recombination by recA. This product is not a suitable cloning host. For transformation, it is highly recommended to use this product for constructing plasmids as mentioned above.

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Stellar Competent Cells

Transformation Efficiency: > 5 × 108 cfu/µg

Stellar Competent Cells (dam/dcm)

Transformation Efficiency: > 1 × 106 cfu/µg


  • Cloning, subcloning
  • Methylated DNA cloning
  • cDNA and genomic library construction
  • Longer-length cDNA library construction

Additional Information

Please see the product's Certificate of Analysis for information about storage conditions, product components, and technical specifications. Please see the Kit Components List to determine kit components. Certificates of Analysis and Kit Components Lists are located under the Documents tab.

Cat. # Product Contents Size Price Units Select
636763 Stellar™ Competent Cells 10 x 100 uL $185.00
636766 Stellar™ Competent Cells 50 x 100 uL $644.00
636767 Stellar™ Competent Cells (96-well plate) 96 x 20 uL $449.00
636764 Stellar™ Competent Cells (dam-/dcm-) 10 Transformations $186.00



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