Used in research and therapeutic development targeting immune system disorders, particularly in the study of B-cell and T-cell migration in lymphoid tissues. Plays a key role in modulating immune responses by blocking CXCR5 receptor activity, which is involved in autoimmune diseases and chronic inflammation. Investigated for potential use in treating conditions such as rheumatoid arthritis, multiple sclerosis, and certain B-cell-mediated lymphomas. Also serves as a reference standard in antibody development and validation for biologics discovery.