... indicated the chain length of the fatty acid on the acyoxyacyl group to be mainly 15,confirming the result of the compositional analysis. In the minor triacylated lipid A, the fragmentation patterns of ... moiety of LPS in the induction of cytokines, including tumor necrosis factor, and the phos-phate residue at the 4¢-position is a critical site for the activity [24]. Therefore, the monophosphoryl ... A in the LPS must be responsible for this weak activity.Structure of OPS moiety in LPSTo analyze the structure of the OPS moiety, the hydrophilicproducts from the acetic acid hydrolysate of...