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(A) In longitudinal section osteons run parallel to calcified cartilage columns of distal/proximal shaft (asterisks). Haematoxylin-eosin stain (bar = 100 µm). (B) In transverse section the structured osteon (asterisk) has advanced along the line of a calcified cartilage column, whose remnants are evident at the periphery of the osteon (arrowheads). Haematoxylin-eosin stain (bar = 100 µm).
