Culture IL-2 dNK clones as described. 2. Characterize NK clones for KIR2DS4, LIR-1, and KIR2DL1 receptors. 3. Select clones positive for one receptor for co-incubation experiments. If no suitable clones are found, repeat the characterization process. 4. Use 30,000 dNK cells per well with irradiated 721.221 transfectant cells for 72 hours at 37°C, 5% CO2. 5. Measure cytokine production via ELISA. If results are not within expected ranges, repeat the co-incubation and measurement steps.