Characteristics of DNA repair induced by DNA polymerase β in hepatoma cells after γ-ray irradiation

Table 1 Effect of DNA polymerase β on the repair of γ-rays irradiated nuclei DNA at different dose rates (¯x ± s)

Dose rate (Gy·min-1)	3H-TTP incorporation (counts. min-1·μg DNA-1)
	Hepatoma nuclei	Hepatocyte nuclei
1	281 ± 50	207 ± 24
5	282 ± 27	204 ± 18
10	284 ± 37	208 ± 22
Control	236 ± 35a	179 ± 17a

n = 7,

^aP < 0.05 compared with irradiated group.

Table 2 Comparison of the increment of ³H-TTP incorporation of irradiated hepatoma nuclei with that of hepatocyte nuclei (counts. min^-1·μg DNA^-1, ¯x ± s)

Dose rate (Gy·min-1)	Increment of 3H-TTP incorporation
	Hepatoma nuclei	Hepatocyte nuclei
1	45 ± 8.0b	28 ± 2.0
5	46 ± 4.4b	29 ± 4.1
10	48 ± 6.3b	32 ± 5.1

n = 7,

^bP < 0.01 compared with hepatocyte nuclei group.