Pattern of S. enterica serovar Typhimurium SH5014 porins and LPS on SDS-PAGE. (A) Lane 1, molecular mass standards (Amersham Pharmacia Biotech, Milan, Italy) (phosphorylase b, 94 kDa,; albumin, 67 kDa; ovalbumin, 43 kDa; carbonic anhydrase, 30 kDa; trypsin inhibitor, 20.1 kDa; α-lactalbumin, 14.4 kDa); lane 2, S. enterica serovar Typhimurium porins (10 μg). (B) Lane 1, S. enterica serovar Typhimurium LPS standard (Sigma-Aldrich S.r.l.); lane 2, S. enterica serovar Typhimurium SH5014 LPS (10 μg).