Table 1.

The hypergeometric test for the co-expression effect among neighboring genes. For every correlation threshold, the number of pair-wise correlations for the adjacent genes that are above the threshold was counted. The probability of randomly drawing such high numbers of gene pairs above the threshold from all of the gene pairs is determined by a hypergeometric distribution, as indicated by the p-values.

Total gene pairs	Neighboring gene pairs	Threshold for correlations	Number of total gene pairs above the threshold	Number of neighboring gene pairs above the threshold	P-values based on the hypergeometric tests
18,797,646	6,116	0.5	616,074	752	2.00e-008
		0.6	251,505	401	4.84e-009
		0.7	89,955	196	1.04e-008
		0.8	21,513	68	1.92e-008
		0.9	1,171	13	4.07e-009