Table 1.

Spontaneous chromosomal aberrations in rad51d mutant and control cell lines^a

Cell line	No. of cells	Breaks	Gaps	Isochromatid breaks	Asymmetrical and symmetrical exchanges	Dicentrics	Centric rings
51D1Lox	351	0.07 ± 0.04	0.7 ± 0.1	0.1 ± 0.05	0	0.003	0
51D1.3 (BAC)	350	0.03 ± 0.03	0.8 ± 0.1	0.15 ± 0.07	0	0	0
51D1	353	0.36 ± 0.09	2.2 ± 0.2	0.7 ± 0.1	0.04	0.003	0.01
Fold increase 51D1 vs. 51D1Lox		5.1b	3.4**	6.6**	—	1	—
Fold increase 51D1 vs. 51D1.3		12c	2.8*	4.9*	—	—	—

^*Indicates P < 0.05 and ^** for P < 0.01 using the student t-test.

^aValues are given as mean number of aberrations per cell ± SEM. Each value is based on the data in three experiments.

^bP = 0.11.

^cP = 0.09.