we found that in the absence of divalent cations rough mutant lipopolysaccharide and free lipid a form unilamellar structures with the main reflections centered around 4.50 nm for free lipid a , 4.80 nm for re lipopolysaccharide , and 5.90 nm for rd1 lipopolysaccharide at 20 degrees c , i.e . below the beta -- -- alpha acyl-chain-melting transition temperature .
C0023767
lipid a
C0023810
lipopolysaccharide