Table 1. Body and organ weight and organ cellularity at 48 weeks of age.

	sex	0 μg/kg mean ± SEM	2.5 μg/kg mean ± SEM	5.0 μg/kg mean ± SEM
Body weight (g)	♀	30.2 ± 0.6	30.7 ± 1.8	27.3 ± 0.7*
	♂	44.5 ± 2.8	41.6 ± 3.3	44.5 ± 0.5
Spleen weight (g)	♀	0.14 ± 0.02	0.13 ± 0.03	0.18 ± 0.02
	♂	0.11 ± 0.01	0.09 ± 0.01	0.10 ± 0.01
Spleen/body weight ratio	♀	0.45 ± 0.07	0.50 ± 0.04	0.64 ± 0.05
	♂	0.25 ± 0.01	0.23 ± 0.03	0.22 ± 0.01
Spleen cellularity (× 106)	♀	57.7 ± 4.8	54.4 ± 9.2	75.2 ± 3.4
	♂	89.9 ± 5.4	82.1 ± 5.5	91.0 ± 4.7
Thymus weight (g)	♀	0.06 ± 0.01	0.06 ± 0.01	0.05 ± 0.01*
	♂	0.06 ± 0.01	0.07 ± 0.01	0.08 ± 0.01
Thymus/body weight ratio	♀	0.19 ± 0.01	0.19 ± 0.01	0.17 ± 0.01
	♂	0.14 ± 0.01	0.16 ± 0.01	0.19 ± 0.03
Thymus cellularity (× 106)	♀	76.2 ± 9.7	67.2 ± 7.0	49.2 ± 6.1*
	♂	72.0 ± 6.5	63.5 ± 7.2	71.3 ± 2.6
Bone marrow cellularity (× 106)	♀	12.7 ± 1.3	15.2 ± 2.6	14.4 ± 1.0
	♂	9.3 ± 1.7	11.5 ± 1.0	7.8 ± 1.1
Lymph node cellularity (× 106)	♀	5.0 ± 0.5	3.3 ± 0.6*	4.9 ± 1.4
	♂	7.8 ± 1.8	7.1 ± 0.6	7.1 ± 1.1

N≥6 mice/treatment/sex;

^*p<0.05, Dunnett's test.