Failure of Gaδ-ab to prevent Gaμ-ab-induced apoptosis.

B-CLL cells from patient C were exposed to Gaμ-ab at 3 different concentrations in the presence of Gaδ-ab or NGI at the indicated concentrations. Apoptotic cells were measured by Annexin-V FITC staining after 18 hours in vitro. The experiment is representative of the 4 carried out on patients with B-CLL (patients C, G, D, F).