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In vitro unprimed assay of spleenocytes (Radiation count/min cpm ¯x± s)
| Group | Radiation count (cpm) |
| PBS control | 2981 ± 389.8 |
| Empty vector control | 3158 ± 416.7 |
| Vaccination group | 2896 ± 335.4 |
Paired student t-test was used to investigate the difference between two groups.
