Figure 5From: Prostaglandin E2 receptor type 2-selective agonist prevents the degeneration of articular cartilage in rabbit knees with traumatic instability Effect of ONO-8815Ly on PCNA expression. The proportion of PCNA-positive cells in (a) medial and (b) lateral femoral condyles, and in (c) medial and (d) lateral tibial condyles. Values are the mean ± standard deviation. N.S, not significant; PCNA, proliferating cell nuclear antigen.Back to article page