Dose-response curves of purified tonsillar B cells to rTNF in polarization and locomotion assays. B lymphocytes were purified and tested as described in Materials and Methods in polarization (A) and locomotion (B) assays. Results are means ± SE from four to six different experiments. * P < .05, ** P < .01, Kruskal-Wallis nonparametric ANOVA analysis.