Using the methods of the present invention, nucleoside analogs may be screened for {HEAD ~ the ability} to be incorporated by reverse transcriptase of human immunodeficiency virus and cause {TAIL ~ incorrect base} pairing 
to cause
Using the methods of the present invention , nucleoside analogs may be screened for { HEAD ~ the ability } to be incorporated by reverse transcriptase of human immunodeficiency virus and cause { TAIL ~ incorrect base } pairing
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