As used herein, {HEAD ~ incorporation} and {TAIL ~ extension} at 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 , { HEAD ~ incorporation } and { TAIL ~ extension } at 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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