Intact Genomics BL21 (DE3) electrocompetent E. coli cells are suitable for high efficiency transformation and routine protein expression. Increased cloning efficiencies versus typical BL21 cells makes the BL21(DE3) electrocompetent E. coli cells ideal for construction of complex expression libraries.Product Includes:BL21 (DE3) electrocompetent cellspUC19 control DNARecovery medium