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