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Hematoxylin-eosin stained femur cross sections of a younger (A) and older (B) Namaqua rock mouse. Adhesion lines in the outer circumferential lamellae (arrows) and the formation of osteons (asterisk) in the older animals indicate maturation and re-organization of bone tissue while aging. (C) Lens weight and body weight for all southern African rodents, letters indicate the animals whose bone structures are shown at the left. Scale bar: 20 μm.
