Table 1. Relatedness of mouse strains by comparison of urinary volatile abundance.

		β2mJ	B6F	B6NCrl	BALB/cCrl	DBA/2Crl
r>1	B6J	5	19	22	25	33
	β2mJ	–	23	26	23	34
	B6F		–	21	35	28
	B6NCrl			–	12	16
	BALB/cCrl				–	11
r>2	B6J	2	12	22	23	32
	β2mJ	–	16	25	21	31
	B6F		–	20	34	25
	B6NCrl			–	10	16
	BALB/cCrl				–	11
r>3	B6J	0	3	9	12	25
	β2mJ	–	4	15	17	27
	B6F		–	12	21	18
	B6NCrl			–	4	14
	BALB/cCrl				–	8
r>5	B6J	0	2	5	6	14
	β2mJ	–	2	4	10	16
	B6F		–	7	12	15
	B6NCrl			–	2	8
	BALB/cCrl				–	6
r>10	B6J	0	1	3	3	9
	β2mJ	–	1	2	5	8
	B6F		–	4	9	12
	B6NCrl			–	0	5
	BALB/cCrl				–	6
r>100	B6J	0	0	0	0	3
	β2mJ	–	0	0	0	2
	B6F		–	0	0	2
	B6NCrl			–	0	4
	BALB/cCrl				–	3

The number of significantly different components in the ensemble of 69 urinary volatiles was calculated for all strain combinations. The ratio, r, was obtained by computing for each significant compound the quotient, r, of the larger and the smaller mean, such that r>1. The total number of significant differences are listed in the upper section of the table, i.e. the means of these components differ by a factor, r>1. The lower sections list the fractions of these components, which differ by more than 2-fold, 3-fold, 5-fold, 10-fold and 100-fold, respectively.