Table 1.

SCE analysis in mouse cells deficient for Blm and Fancd2. Errors represent standard errors of the mean, p values were calculated by an unpaired two-tailed t test.

Mouse fibroblasts	Treatment	SCEs/chromosome	p value
Blm−/+ Fancd2−/+	None	0.64 + 0.05
Blm−/+ Fancd2−/−	None	0.72 + 0.05	0.34
Blm−/− Fancd2−/+	None	1.08 + 0.07	<0.0001
Blm−/− Fancd2−/−	None	1.30 + 0.09	<0.0001