Table 1.

Ratio of x²c⁵Ura:c⁵Ura in the presence or absence of reducing agent after exposure to one equivalent H₂O₂ for 10 min.^a

Rescue Agent	s2c5Ura:c5Ura	se2c5Ura:c5Ura
None	0.4	7.1b
DTTc	0.6	8.3
Ascc	1.1	6.3
GSHd	2.9	> 25e
Ascd	1.1	> 25e

^ax²c⁵Ura = s²c⁵Ura or se²c⁵Ura.

^bAll se²c⁵Ura was converted to the diselenide (3d), so this value is reported as the ratio of the 3d to c⁵Ura.

^cReducing agent added after 2 minutes of exposure to H₂O₂.

^ds²c⁵Ura:c⁵Ura or se²c⁵Ura was incubated with reducing agent prior to addition of H₂O₂.

^eThe ratio was very difficult to determine because there was so little c⁵Ura present.