Table 2.

Analysis of paired-end depths for human and lamprey BACs

Copy #	Species	Count	Prop (obs)	Prop (exp)	% Enrichment	χ2 (DF)	P
LL	Lamprey	181	0.30	0.16	91	77.9 (1)	1.1E−18
	Human	103,198	0.93	0.88	5
HL	Lamprey	117	0.19	0.48	−60	102.4 (1)	4.5E−24
	Human	3,235	0.03	0.11	−74
HH	Lamprey	306	0.51	0.36	39	33.6 (1)	6.6E−09
	Human	5,057	4.5E−3	0.00	1,166
Total	Lamprey	604				214.0 (2)	3.4E−47
	Human	111,490

BACs were assigned to one of three categories (LL, HL, and HH—see manuscript text for explanation). Proportions of LL and HH BACs were significantly greater than expected given random sampling and the observed frequencies of low- and high-copy BAC ends in each species

% Enrichment the percentage of the expected values by which the observed exceed expectation [(100×(obs−exp))−100], obs observed, exp expected, DF degrees of freedom