Table 3. CD8/CD4 ratio in PBMCs from young and old marmosets.

Age	Sex	% positive		CD8/CD4 ratio
		CD8	CD4
3 month*	male	58.3	38.4	1.52
1.5 year	female	60.7	36.1	1.68
1.5 year*	male	55.1	41.5	1.33
2.0 year	male	52.7	44.6	1.18
10 year*	female	58.6	37.8	1.55
Mean ± sd		57.1±3.2	39.7±3.4	1.45±0.20

^*Only FACS analysis, but not qPCR, was done with PBMCs from these three marmosets.