ArcticExpress Competent Cells are engineered to address the common bacterial gene expression hurdle of protein insolubility. These cells are derived from the high-performance Stratagene BL21-Gold competent cells, enabling efficient high-level expression of heterologous proteins in Escherichia coli. Low growth temperatures enhance protein folding and solubility Feature chaperonins Cpn60 and Cpn10 from psychrophilic bacterium Oleispira Antarctica Correct for codon bias and enhance solubility at the same time