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Histological staining of Tartrate‐resistant acid phosphatase (TRAP)‐positive OCs. TRAP‐positive OCs are indicated by>. Sample size was n = 10 for aged individuals and n = 6 for young individuals. Data are presented as mean ± S.E.M.; Student's t‐test. (** P < 0.01). Scale bar: 50 μm.
