Expression of IL-17RA protein in brain, spinal cord and spleen tissue from adult mouse. 5 μm thick serial cross sections were processed for immunohistochemisty. Immunostaining with anti-IL-17RA antibody and counterstaining with hematoxyline demonstrated a subpopulation of IL-17RA positive cells in spleen cells as shown here and in Figure 3 (C, D; appear in brown). Immunostained section of brain surrounding the hippocampal region (A) and cross section of spinal cord (B) demonstrated non-specific binding of IL-17RA. Original magnification for A, B and C was 100× and D was 400×.