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Radius and ulna; black vulture No. 2. Median section of formalin-fixed proximal radius and ulna. (a) Normal radius and ulna from an unaffected black vulture. Note the thin regular layer of articular cartilage. (b) Severe chronic arthritis, left elbow (vulture No. 2). Cartilage fibrillation (arrow), ulceration (arrow head) and thickening of subchondral bone plate are observed.
