1.14.13.172 enzyme S5H is encoded in the salABCD gene cluster, which locates on the chromosome rather than on a mobile plasmid, functional recombinant expression in Escherichia coli 1.14.13.172 expressed in Escherichia coli BL21(DE3) cells 1.14.13.172 expressed in Escherichia coli BL21(DE3)/pLysS cells 1.14.13.172 expressed in Escherichia coli DH5alpha cells