Representative plots of CCR4+CCR6+ T-helper and regulatory T cells. Representative plots of peripheral circulating populations of (A1) to (A3) CCR4+CCR6+ T-helper (Th) cells (green) and (B1) to (B3) regulatory T (Treg) cells (red) in peripheral blood mononuclear cells (PBMCs) of patients with ankylosing spondylitis (ASp) (A1, B1), HLA-B27-negative healthy donors (HD1) (A2, B2) and HLA-B27-positive healthy donors (HD2) (A3, B3). FOX-P3, forkhead box P3; FSH, forward scatter-height; SSH, side scatter-height.
Wu et al. Arthritis Research & Therapy 2011 13:R29 doi:10.1186/ar3257