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Radiographic medio-lateral views and the corresponding histological sections of the left humerus of a 15 days-old Maltese dog (a, b) and of a 28 days-old Chihuahua (c, d) respectively. With the progression of age, OC changes its aspect loosing the roughly round aspect (compare a and c), it flattens and passes from an OCT-2 (b) to an OCT-3 (d). Histological sections are stained with haematoxylin-eosin. Bar 0.5 mm
