Chemokines are proinflammatory cytokines, which play a pivotal role in the selective recruitment of T cells via chemokine receptors.[26] Numerous previous studies have shown that chemokines, including CXCL10,[27] CXCL12,[28] CCL5 and CXCL9[29] are implicated in the pathogenesis of OLP and HT. The gene discussed is CCL5; the disease is hematocrit.