Apoptosis of CCR6⁺ CD4 T cells: comparison of uninfected and HIV-infected individuals. (A) Sensitivity to apoptosis of CCR6-expressing splenocytes. Representative staining of splenocytes for expression of CCR6 and annexin V within CD8⁺ splenocytes. Percentages of cells in each quadrant are indicated. (B) The percentage of annexin V⁺ splenocytes was studied according to the expression of CCR6 within CD4⁺ splenocytes for 5 UI (□) and 5 HIV-infected (▪) individuals. **P < .01. Error bars represent SEM.