TABLE 3.

Relative PPT use^a

Virus	Relative mutant PPT use
Wild-type tandem	1.00
−2C	0.51
−4C	0.29
−7/−17	0.35
−14/−19	0.94
−21/−28rev1	0.13
−21/−28PPT2	0.24

^aQuantified by calculating the ratio of both bands that result from priming using the mutant PPT (mutant PPT plus Δmutant PPT) to total priming (the sum of PPT1, ΔPPT1, PPT2, and ΔPPT2). The mutant PPT is PPT1 for −2C, −4C, −7/−17, and −14/−19; the mutant PPT is PPT2 for −21/−28PPT2. −21/−28rev1 use was quantified by calculating the ratio of PPT1 plus ΔPPT1 to total priming (the sum of PPT1, ΔPPT1, PPTA, ΔPPTA, PPT2, and ΔPPT2). Wild-type PPT in PPT1 was assigned a value of 1, and other values were normalized to this number. Values are the averages of two experiments.