Figure 3.

Induction of the proliferation of splenic NK by KLH in vitro. NK cells purified from the spleen of C57BL/6 mice by negative selection were incubated with or without 25 μg/ml of KLH for 42 h, being pulse-labeled with [3H]thymidine for the last 18 h. The data are mean ± SEM of three separate experiments. **P < 0.01, as compared with the values of control (Student's t-test)