Fig. 7From: Establishment of a bipedal rat model of lumbar facet joint osteoarthritis using intraarticular injection of urinary plasminogen activatorImmunohistochemical staining of TNF-α in saline-injected control and the uPA-injected groups at 7, 14, 28, and 42 days after surgery. Scale bar = 100 μm; *: p < 0.05; NS: no significanceBack to article page