phospholipid biosynthetic process lipid A biosynthetic process lipid A anabolism lipid A biosynthesis MetaCyc:NAGLIPASYN-PWY The chemical reactions and pathways resulting in the formation of lipid A, the glycolipid group of bacterial lipopolysaccharides, consisting of four to six fatty acyl chains linked to two glucosamine residues. Further modifications of the backbone are common. lipid A synthesis GO:0009245 biological_process lipid A formation glycolipid biosynthetic process lipid A metabolic process lipooligosaccharide biosynthetic process