{HEAD ~ The biomolecules} can be labeled with {TAIL ~ the dyes} either directly or indirectly through a phosphoramidite 
labeled with
{ HEAD ~ The biomolecules } can be labeled with { TAIL ~ the dyes } either directly or indirectly through a phosphoramidite
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH