General Cloning

The XL1-Blue strains are an all-prupose line of competent cells that are ideal for routine cloning needs. The XL1-Blue strains were designed to provide a host for optimal propagation of both plasmid and lambda phage vectors. They allow for blue-white color screening, single-stranded rescue of phagemid DNA and preparation of high quality plasmid DNA. This strain is available in a wide variety of transformation efficiencies, including XL2-Blue which is a high-efficiency derivative, and in either chemically or electroporation-competent versions.


3 kits for the price of 2! Use Promotion code "1013" when placing an order. View complete list of products eligible for promotion here. 1. Customers purchasing through distributors in selected countries can use promo code “1014” when placing an order.

Note #

  • Part numbers of all 3 kits must be provided when placing the order.
  • All the products in each product category may not be eligible for the promotion.


For Research Use Only. Not for Use in Diagnostic Procedures.

Product Catalog Kit Size Quantity Price  
XL1-Blue Subcloning Grade Competent Cells

For cloning where DNA is not limited, ≥ 1 x 106 transformations/µg

Certificate of Analysis
200130 8 x 0.5 mL $125.00
XL2-Blue Ultracompetent Cells

Highest cloning efficiency, > 5 x 109 transformants/µg

Certificate of Analysis
200150 10 x 0.1 mL $250.00
XL1-Blue Electroporation-Competent Cells

For cloning unmethylated DNA, ≥1 x 1010 transformants/µg

Certificate of Analysis
200228 5 x 0.1 mL $233.00
XL1-Blue Supercompetent Cells

For high-efficiency cloning, ≥1 x 109 transformants/µg

Certificate of Analysis
200236 5 x 0.2 mL $215.00
XL1-Blue Competent Cells

For routine cloning, ≥ 1 x 108 transformants/µg

Certificate of Analysis
200249 5 x 0.2 mL $148.00
Routine Cloning Competent Cell Pack

We have competent cells to fulfill all your cloning needs. This economical competent cell pack lets you optimize your experimental design.

Certificate of Analysis
230248 1 Pack $118.00