Phosphocholine is a metabolic product from phosphatidylcholine that forms the typical cellular membrane bilayer structure with phosphorylethanolamine
and other neutral lipids controlling membrane integrity.
Within these three types of LPS, further levels of heterogeneity also exist; for instance the number of KDO units in the core oligosaccharide may vary, so too may the degree of phosphorylation or phosphorylethanolamine
For the present studies, limulin was purified to homogeneity from the plasma of Limulus by sequential affinity chromatography on phosphorylethanolamine
(PE)-agarose and fetuin-Sepharose, a sialic acid affinity resin.