As used herein, incorporation and {HEAD ~ extension} at {TAIL ~ high efficiency} by HIV RT means equal to or greater than one percent of that achieved with the natural complementary deoxynucleotide triphosphate 
As used herein , incorporation and { HEAD ~ extension } at { TAIL ~ high efficiency } by HIV RT means equal to or greater than one percent of that achieved with the natural complementary deoxynucleotide triphosphate
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