IL17A and myeloid sarcoma: Studies further revealed that Vδ1 T cells expressed high level of IFN-γ that correlated with inflammation and nerve damage in newly diagnosed MS, whereas CD161high CCR6+ γδ T cells (a γδ T cell subset expressing IL-17 in human) were enriched and produced IL-17 in the CSF of patients during relapse (58, 71).