Comparative analysis of TREC contents within purified CD4 and CD8 T-cell populations of HIV-1-infected subjects at different stages of HIV-1 disease and HIV-negative subjects. Early-stage disease (more than 500 CD4 T cells), intermediate-stage disease (200-500 CD4 T cells), and late-stage disease (less than 200 CD4 T cells). Asterisks indicate statistical significance (P < .05) between TREC contents within CD4 (A) and CD8 (B) T-cell populations in HIV-1-infected subjects (▦) and HIV-negative subjects (□). Data are expressed as mean ± SE.