Joints and joint fluid.
D000328:Adult; D003165:Complement System Proteins / Q000032:analysis; D003937:Diagnosis, Differential; D006801:Humans; D007592:Joint Diseases / Q000175:diagnosis*; D012446:Sacroiliac Joint; D013167:Spondylitis, Ankylosing / Q000175:diagnosis; D013582:Synovial Fluid / Q000032:analysis*
D003165:Complement System Proteins