Table 5.

Rates for T → C errors during dimer bypass

	Error rate (×10−4)
	T7exo−		Pol ηa		Dpo4a
	3′ Tb	5′ Tc	3′ T	5′ T	3′ T	5′ T
Undamaged	5	1 (5↓)	400	140 (3↓)	100	36 (3↓)
TT dimer	37	4 (9↓)	390	32 (12↓)	1000	15 (67↓)

^aRates for human pol η [16] and S. solfataricus Dpo4 [12] shown for comparison.

^bError rates at the 3′ T come from sequencing of dark blue plaques as described in Table 4.

^cRates at the 5′ T come from plaque hybridization experiments [16]. Values in parentheses are the fold decrease between 3′ and 5 ′ rates.