A method of screening for a nucleoside analog that is incorporated and extended at {HEAD ~ high efficiency} by {TAIL ~ reverse transcriptase} of human immunodeficiency virus and causes incorrect base pairing, said analog incorporated preferentially by HIV RT relative to incorporation by a mammalian DNA polymerase, comprising: 
by
A method of screening for a nucleoside analog that is incorporated and extended at { HEAD ~ high efficiency } by { TAIL ~ reverse transcriptase } of human immunodeficiency virus and causes incorrect base pairing , said analog incorporated preferentially by HIV RT relative to incorporation by a mammalian DNA polymerase , comprising :
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