{HEAD ~ Section I} of the specification describes {TAIL ~ HPLC processes} for purification of endogenous amplifier materials derived from human leukocyte dialysates 
describes
{ HEAD ~ Section I } of the specification describes { TAIL ~ HPLC processes } for purification of endogenous amplifier materials derived from human leukocyte dialysates
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH