CD27 and systemic lupus erythematosus: A subset of CD27+ CD25high Vδ1 T cells expressing FoxP3 were gradually decreased in the PB of systemic lupus erythematosus patients progressing in the pathogenesis of SLE and these regulatory γδ T cells could be generated in vitro when stimulated with anti γδ-TCR in presence of IL-2 and transforming growth factor-beta (TGF-β) (101).