The survival of splenic CD4+CD25+ cells following lethal irradiation
Day after irradiation .  | Average total spleen cell no., × 106 .  | Average % CD4+CD25+ .  | 
|---|---|---|
| Nonirradiated | 46 | 1.7 | 
| Day 1 | 5.2 | 3.3 | 
| Day 2 | 2.8 | 2.6 | 
|  Day 3  |  0.8  |  6.1  | 
Day after irradiation .  | Average total spleen cell no., × 106 .  | Average % CD4+CD25+ .  | 
|---|---|---|
| Nonirradiated | 46 | 1.7 | 
| Day 1 | 5.2 | 3.3 | 
| Day 2 | 2.8 | 2.6 | 
|  Day 3  |  0.8  |  6.1  | 
The average total spleen cell number and percentage of splenic CD4+CD25+ cells were calculated for nonirradiated BALB/c mice or those that had received 850 cGy total body irradiation at day —1, —2, or —3. Data are from 5 mice in each irradiated group and 3 nonirradiated mice.