{HEAD ~ The reagent composition} contains complement and {TAIL ~ cells} which contain quantitatively determinable substance therein 
{ HEAD ~ The reagent composition } contains complement and { TAIL ~ cells } which contain quantitatively determinable substance therein
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH