. "The chemical reactions and pathways resulting in the formation of the enterobacterial common antigen, an acidic polysaccharide containing N-acetyl-D-glucosamine, N-acetyl-D-mannosaminouronic acid, and 4-acetamido-4,6-dideoxy-D-galactose. A major component of the cell wall outer membrane of Gram-negative bacteria." . . . "enterobacterial common antigen biosynthetic process" . "enterobacterial common antigen anabolism" . "enterobacterial common antigen biosynthesis" . "enterobacterial common antigen formation" . "enterobacterial common antigen synthesis" . . .