The rfaS gene, which is involved in production of a rough form of lipopolysaccharide core in Escherichia coli K-12, is not present in the rfa cluster of Salmonella typhimurium LT2.

Eitemau Tebyg

• Structures of the rfaB, rfaI, rfaJ, and rfaS genes of Escherichia coli K-12 and their roles in assembly of the lipopolysaccharide core.
  gan: Pradel, E, et al.
  Cyhoeddwyd: (1992)
• Comparison of lipopolysaccharide biosynthesis genes rfaK, rfaL, rfaY, and rfaZ of Escherichia coli K-12 and Salmonella typhimurium.
  gan: Klena, J D, et al.
  Cyhoeddwyd: (1992)
• Identification and sequences of the lipopolysaccharide core biosynthetic genes rfaQ, rfaP, and rfaG of Escherichia coli K-12.
  gan: Parker, C T, et al.
  Cyhoeddwyd: (1992)
• Physical maps of the rfa loci of Escherichia coli K-12 and Salmonella typhimurium.
  gan: Schnaitman, C A, et al.
  Cyhoeddwyd: (1991)
• Insertion of the F Factor into the Cluster of rfa (Rough A) Genes of Salmonella typhimurium
  gan: Sanderson, Kenneth E., et al.
  Cyhoeddwyd: (1972)