We obtained antibiotics and reagents used in this study except ampicillin, kanamycin, chloramphenicol and isopropyl β-D-1-thiogalactopyranoside (IPTG) from Wako Pure Chemical Industries, Ltd. (Osaka, Japan). Ampicillin, kanamycin, chloramphenicol and IPTG were purchased from Nacalai tesque (Kyoto, Japan).
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