E. cloni 10G BAC-Optimized Electrocompetent Cells (> 1 × 10^7 cfu/µg 150 kb BAC DNA; > 1 × 1010 cfu/µg pUC DNA). The first competent cells developed by Lucigen specifically for large DNA cloning. Manufactured using a novel procedure that maximizes transformation efficiencies with very large inserts, 10G BAC-Optimized Cells are an excellent choice for BAC library construction and large construct transformation.