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Section of bone from the mid-shaft of the human fibula. A historadiogram showing differing shades of gray from nearly white to nearly black that reflect the differing concentrations of calcium. The most recently deposited haversian systems are incompletely calcified and appear dark gray, whereas older ones containing higher concentrations of calcium are lighter. The old interstitial lamellae, being fully calcified, are the most highly absorptive and, therefore, appear white. LM