Percentage of apoptotic nuclei of cells treated with DEX alone (100 nmol/L) or DEX plus different concentrations (number in parentheses) of anti-CD2 MoAbs adhered on 96-well plates. Analysis of apoptosis by flow cytometry was performed after incubation for 20 hours. The percentage of apoptotic nuclei (broad hypodiploid peak) in a representative experiment is indicated in each histogram. PI fluorescence (DNA content) versus number of nuclei is shown.