Table I.

Frequency of association between chromosomes and 53BP1-OPT domains

Chromosome number	Chromosome size	Colocalization with 53BP1-OPT domains	No colocalization with 53BP1-OPT domains
	Mb	%	%
2	243	45 (n = 168)	55 (n = 203)
3	198	41 (n = 129)	59 (n = 188)
6	171	32 (n = 113)	68 (n = 241)
7	159	36 (n = 105)	64 (n = 194)
14	107	26 (n = 79)	74 (n = 235)
16	90	27 (n = 99)	73 (n = 261)
17	81	24 (n = 81)	76 (n = 254)

Results represent the average of two independent experiments. n = number of cells analyzed.