Methods of screening for {HEAD ~ nucleoside analogs} that are incorporated by HIV reverse transcriptase and cause {TAIL ~ incorrect base} pairing 
cause
Methods of screening for { HEAD ~ nucleoside analogs } that are incorporated by HIV reverse transcriptase and cause { TAIL ~ incorrect base } pairing
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH