Strains, plasmids and primers used.

Restriction sites are underlined and a rho-transcriptional terminator sequence is highlighted in bold. NCFB, National Collection of Food Bacteria.限制性酶切位点（restriction sites）以下划线标示，ρ转录终止子序列（rho-transcriptional terminator sequence）以粗体高亮标注。NCFB即国家食品细菌保藏中心（National Collection of Food Bacteria）。