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Total callus area (μm2) measured in fluorescence-labeled sections of the tibia divided into ventral (v), dorsal (d), and endosteal (e) regions in intact and OVX rats exposed to the different vibrations (30–90 Hz). Means with different letters differ significantly between the treatment groups, at the dorsal or endosteal region (P < 0.05, Scheffé test). a Vertical WBV (experiment 1), b horizontal WBV (experiment 2)
