Effect on CXCL13- (A-D) and CXCL12- (negative control; E) induced migration of human and murine cells. Human pre-B-697-hCXCR5 cells (A, E), human pre-B-697-hCXCR4 cells (E), human tonsillar cells (B, E), C57BL/6 splenocytes (C, E), and SJL mouse splenocytes (D, E) were seeded into Transwell inserts. Diluted chemokines +/− antibodies were added into the lower chambers and plates were incubated for 2 h at 37°C (50 ug/ml of each antibody were used in CXCL12-induced migration assay). Inserts were removed and Alamar blue was added to the wells and incubated at 37°C overnight. Fluorescence was measured at wavelengths of 530 nm and 590 nm and the percent inhibition of chemokine-induced migration (A-D) or migration index (E) was calculated. Data represents an average of the measurements from at least three independent experiments + SEM. Statistical significance (relative to the isotype controls) was evaluated using one-way ANOVA followed by Bonferroni’s multiple comparison post test **** P < 0.0001; *** P < 0.0003; **P < 0.01.