Effect of anti–IL-15 antibodies on accessory function of pulmonary macrophages. The figure shows data on the inhibitory activity of M110 anti–IL-15 MoAb (consistent results were obtained using two additional MoAbs, ie, M111 and M112 reagents). The above-quoted antibodies, when added to the assays at the beginning of culture, significantly inhibited the mitogen-induced proliferation of highly purified CD8⁺ T cells.