Expression of CD10 by apoptosing peripheral blood T cells from HIV-seropositive patients. Peripheral blood MNC from 1 normal control or 2 HIV-seropositive patients were double or triple stained as indicated in Fig 6, and analyzed by flow cytometry. The quadrants were drawn based on the analysis of negative controls stained with an irrelevant (isotype-matched) MoAb or in the absence of Annexin-V-FITC.