Also, in sites of infection and inflammation, they can secrete pro-inflammatory chemokines and cytokines such as interleukin 6 (IL-6), interleukin 12 (IL-12), chemokine (C-X-C motif) ligand 8 (CXCL8), chemokine (C-X-C motif) ligand 10 (CXCL10), chemokine ligand (C-C motif) ligand 3 (CCL3), and chemokine ligand (C-C motif) ligand 4 (CCL4) to recruit immune cells [52]. Here, IL6 is linked to infection.