Cells were cultured at small scale in the presence of carbenicillin (50 mg/ml; forpMSD8),kanamycin (50 mg/ml; forpXL49) and chloramphenicol(34 mg/ml; for pMSD15), and induced at an OD600 of 0.5–0.6 with 0.4% arabinose (for pMSD15) followed by 0.1mMIPTG(for pMSD8 and pXL49)1h later unless specified otherwise.