Enhanced depletion of NHL cells from whole blood. Fresh heparinized human blood was mixed with either Daudi or Ramos and incubated with 20-2b (●), v-mab (○), 734-2b (■), or v-mab plus 734-2b (□) at 0.01, 0.1, or 1 nM for 2 days. The effect of the indicated treatments on lymphoma and peripheral blood lymphocytes was evaluated using flow cytometry. Error bars represent SD.