As summarized above, {HEAD ~ the R1 group} can include {TAIL ~ a biomolecule} or a chemical group enabling the amplifier to be attached to a biomolecule 
As summarized above , { HEAD ~ the R1 group } can include { TAIL ~ a biomolecule } or a chemical group enabling the amplifier to be attached to a biomolecule
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH