CXCL13 and diffuse large B-cell lymphoma: Second, many primary AIDS-NHL specimens, of both the Burkitt and DLBCL subtypes, showed expression of CXCL13 (Figure 2).Third, as noted in (Section 3), the AIDS-Burkitt cell line, 2F7, expressed low levels of CXCL13 after it had been growing in culture for several months (not shown).