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