Fig. (5) Analysis of Ki67 expression in sections of normal articular cartilage from human knee articular cartilage. Immunofluorescence for Ki67 in both superfical and deep cartilage at 20x [A]. Immunohistochemistry for Ki67 in both superficial and deep cartilage at 20x [B]. Percentage of cells positive for Ki67 in both cartilage biopsies [C]. *p<0.05.