Table 1.

The number of unique markers and the average density of 10-mer ~ 26-mer subsequences in the database of HGI and RGI.

N-mer	HGIa		RGIb
	Unique Markers	Average Udc	Unique Markers	Average Ud
10-mer	0	0.000000	4	0.000000
11-mer	6	0.000000	9,669	0.000120
12-mer	24,164	0.000054	457,681	0.005675
13-mer	1,124,491	0.002513	4,167,009	0.051672
14-mer	9,488,257	0.021202	15,364,798	0.190527
15-mer	35,768,666	0.079925	27,962,463	0.346742
16-mer	66,958,259	0.149618	34,903,375	0.432811
17-mer	85,694,125	0.191484	37,636,118	0.466698
18-mer	94,052,393	0.210160	38,645,904	0.479219
19-mer	97,689,916	0.218288	39,061,604	0.484374
20-mer	99,559,386	0.222466	39,276,816	0.487043
21-mer	100,781,233	0.225196	39,417,681	0.488789
22-mer	101,743,851	0.227347	39,522,956	0.490095
23-mer	102,583,079	0.229222	39,608,919	0.491161
24-mer	103,348,039	0.230931	39,682,141	0.492069
25-mer	104,057,929	0.232518	39,744,826	0.492846
26-mer	104,724,128	0.234006	39,800,164	0.493532

^aHGI, human gene index; ^bRGI, rat gene index; ^cU_d, the density of the unique subsequences.