Table 2. dRN Pools in HepG2 Cells of Different Groups (pmol/10⁶ Cells)^a.

	control	H2O2 1.0 mM	thymidine 600 μM	thymidine 600 μM + H2O2 1.0 mM
dATP	27.95 ± 2.09	21.47 ± 2.74*	44.32 ± 12.50	53.50 ± 4.04**##
dADP	0.02 ± 0.00	0.01 ± 0.00**	0.07 ± 0.01**	0.06 ± 0.00**##
dAMP	UDL	UDL	0.01 ± 0.00	0.01 ± 0.00
dCTP	25.19 ± 0.85	8.02 ± 1.36**	7.25 ± 2.01**	14.86 ± 0.92**##ΔΔ
dCDP	0.04 ± 0.01	0.01 ± 0.00**	0.01 ± 0.00**	0.02 ± 0.00**##Δ
dCMP	0.01 ± 0.00	UDL	0.01 ± 0.00	0.01 ± 0.00
dGTP	13.27 ± 0.94	7.70 ± 0.73**	47.77 ± 5.95**	47.93 ± 6.50**##
dGDP	2.45 ± 0.29	1.45 ± 0.63	28.30 ± 4.39**	19.32 ± 0.88**##Δ
dGMP	0.87 ± 0.27	0.68 ± 0.15	15.61 ± 3.49**	6.25 ± 0.21**##ΔΔ
dTTP	110.26 ± 10.53	31.42 ± 2.51**	672.97 ± 170.43**	922.27 ± 47.90**##
dTDP	2.14 ± 0.25	3.41 ± 0.31**	18.17 ± 3.56**	16.89 ± 1.03**##
dTMP	0.08 ± 0.01	0.02 ± 0.01**	0.42 ± 0.09**	0.45 ± 0.06**##

^aUDL, under detected limit of assay; *p < 0.05 and **p < 0.01, compared with the control group; ^#p < 0.05 and ^##p < 0.01, compared with the H₂O₂ 1.0 mM group; and ^Δp < 0.05 and ^ΔΔp < 0.01, compared with the thymidine 600 μM group.