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