Figure 4From: Urokinase, a constitutive component of the inflamed synovial fluid, induces arthritisEssential role of monocytes and lymphocytes for the development of urokinase plasminogen activator (uPA)-induced arthritis. Frequency of histological signs of arthritis 4 days after a single injection of low molecular weight uPA (60 pmol/knee). Significance regarding the difference of incidence of arthritis between the groups is indicated.Back to article page