Table I.

Organ coefficients of mice (%) presented as the mean ± standard deviation; n=40.

	IRM-2		615		ICR/JCL
Organ	Male	Female	Male	Female	Male	Female
Thymus	0.13±0.03	0.28±0.05	0.21±0.02a	0.52±0.10a	0.25±0.1a	0.45±0.12a
Spleen	0.33±0.04	0.43±0.04	0.42±0.10	0.41±0.11	0.42±0.09	0.45±0.13
Heart	0.47±0.03	0.47±0.02	0.53±0.11	0.55±0.12	0.58±0.13	0.55±0.15
Lung	0.57±0.06	0.68±0.05	0.72±0.12	0.85±0.13	0.76±0.15	0.85±0.18
Kidney	1.64±0.04	1.23±0.05	1.23±0.13	1.03±0.12	1.50±0.15	1.28±0.12
Liver	5.53±0.35	4.68±0.31	4.22±0.50	4.25±0.53	6.01±0.58	5.20±0.50

^aP<0.01 vs. IRM-2 mice of the same gender.