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Natural lipid A from Salmonella minnesota, Salmonella typhimurium, Neisseria meningitides (with and without Kdo), Escherichia coli, Campylobacter jejuni, Rhodobacter capsulatus and Rhodobacter sphaeroides; the biosynthetic lipid A precursor: Lipid IVa and the synthetic molecule Eritoran. The numbers of carbon atoms of each fatty acid chain are displayed in blue.
