The linking groups provide adequate distance between the dye and {HEAD ~ the biomolecule} for {TAIL ~ efficient attachment} without imparting excessive hydrophobicity 
for
The linking groups provide adequate distance between the dye and { HEAD ~ the biomolecule } for { TAIL ~ efficient attachment } without imparting excessive hydrophobicity
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH