VX5 is a humanized IgG1κ monoclonal antibody inhibitor targeting BCA-1/CXCL13. VX5 significantly inhibits human CXCL13-mediated internalization of CXCR5, blocks both human and mouse CXCL13-dependent B-cells chemotaxis and migration (EC50s for 105 and 253 nM for human tonsillar and pre-B-697-hCXCR5 cells, respectively) . VX5 can be used to study autoimmune diseases like multiple sclerosis and arthritis, and cancers like gastric lymphomas and colon cancer[1].