Table 1. Observed and expected number of the top 1000 peaks that contain multiple number of Helper sites and at least one WRE.

	Number of peaks with 1+ WRE	Helper sites per peak (N)	Number of peaks with N+ Helper sites	Expected number of peaks with botha	Observed number of peaks with both	P-value
WT	506	1	193	33	80	2.6E-12
WT	506	2	185	4	27	1.6E-11
WT	506	3	37	0	11	3.3E-07
WT	506	4	27	0	4	0.021
WT	506	5	21	0	3	0.081
mut	423	1	54	1	32	6.6E-29
mut	423	2	7	0	4	0.020
mut	423	3	1	0	0	-
mut	423	4	1	0	0	-
mut	423	5	0	0	0	-

^aSee Materials and Methods.