Besides, development of ectopic lymphoid follicles (eLF) was partly dependent on the cytokine interleukin 17 (IL-17) and the Th17 cell surface molecule Pdpn in experimental autoimmune encephalomyelitis (EAE), the animal model of MS (Jäger et al., 2009; Peters et al., 2011). Here, IL17A is linked to myeloid sarcoma.