Incorporation of the analog is expressed as {HEAD ~ a percent} of {TAIL ~ incorporation} of the complementary deoxynucleotide 
of
Incorporation of the analog is expressed as { HEAD ~ a percent } of { TAIL ~ incorporation } of the complementary deoxynucleotide
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH