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