6.3.2.23 - 6.3.2.23 expression in Escherichia coli 6.3.2.23 expression in Escherichia coli BL21 6.3.2.23 recombinant expression of N-terminally maltose binding protein- and His-tagged enzyme in Escherichia coli strain BL21(DE3), subcloning in Escherichia coli strain DH5alpha