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Regional height of lumbar and coccygeal intervertebral discs from young and old mice. A: both lumbar and coccygeal discs were greater with aging. B: disc shape (convexity) was greater in old coccygeal discs. Disc shape represents the ratio of center height to the mean of anterior and posterior height. Values are means ± SD. *Significant difference vs. young, P < 0.05.
