... PsA is generally characterized byneovascularization, and inflammatory infiltration with predomi-nantly mononuclear cells (T lymphocytes, B lymphocytes and plasma cells, and macrophages), although ... tissues[16,19].After incubation with the primary antibody, sections weresequentially incubated with a biotinylated second antibody, a streptavidine–horseradish peroxidase link, and finally with amino-ethyl-carbazole ... (USpA) and RA, and compared the synovium of oligoarticular versus polyarticularPsA. Synovial biopsies were obtained from patients with RA,nonpsoriatic SpA (AS + USpA), and oligoarticular and polyarticular...