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Complementation of wzySf deficiency by WzySf-GFP. LPS samples (equivalent to 1 × 109 bacterial cells) were prepared from the indicated strains by proteinase K treatment, electrophoresed on an SDS–15% (wt/vol) PAGE gel, and silver stained (see Materials and Methods). The positions of S-LPS, SR-LPS, and R-LPS are indicated. The numbers on the right indicate the Oag RUs.
