Table 2.

APE1 overexpression increases the level of sister chromatid exchanges

Cell lines	SCEs/cell
	Mean	SEM
EM9-XH	6.9	0.4
EM9-V	45.5	1.4
EM9-APE1	60.6*	1.8

SEM, standard error of the mean.

^*P < 0.0001 (Mann–Whitney test) for the difference between EM9-V and EM9-APE1.