Yi-Gang Xu

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Using two-step plasmid integration in the presence of 5-fluorouracil (5-FU), we developed a stable and markerless Lactobacillus casei strain for vaccine antigen expression. The upp of L. casei, which encodes uracil phosphoribosyltransferase (UPRTase), was used as a counterselection marker. We employed the Δupp isogenic mutant, which is resistant to 5-FU, as(More)
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