{HEAD ~ An effective trapping media} functions by binding {TAIL ~ gels} that carry ultratrace analytes on their surfaces 
functions by binding
{ HEAD ~ An effective trapping media } functions by binding { TAIL ~ gels } that carry ultratrace analytes on their surfaces
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH