“…16 The IL-17 receptors also constitute a distinct family of cytokine receptors; the family includes IL-17RA, IL-17RB, IL-17RC, IL-17RD and IL-17RE, 17 all of which are type I transmembrane proteins. IL-17RA (or IL-17R) was the first described IL-17 receptor, 2,19 and it binds IL-17A with higher affinity than IL-17F in human. IL-17RA appears to be ubiquitously expressed in hematopoietic tissues, 2,18 various myeloid cells, epithelial cells, fibroblasts, endothelial cells, epithelial cells and osteoblasts.…”