A polydeoxyribonucleotide 1 wherein said {HEAD ~ GRF form} is {TAIL ~ GRF OH} 
is
A polydeoxyribonucleotide 1 wherein said { HEAD ~ GRF form } is { TAIL ~ GRF OH }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL