Analysis of the appearance and disappearance of members of the complex and of the cross linked substance provides {HEAD ~ a tool} for evaluating {TAIL ~ components} of living systems and thereby to follow the effects of treatments of, and abnormalities in, these systems 
Analysis of the appearance and disappearance of members of the complex and of the cross linked substance provides { HEAD ~ a tool } for evaluating { TAIL ~ components } of living systems and thereby to follow the effects of treatments of , and abnormalities in , these systems
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH