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The number of osteoblasts per total area (NOb/TAR; A) and the number of osteoclasts per total area (NOc/TAR; B) after 28 d of treatment with PTH (solid bars) or vehicle (open bars) in Rac2−/− and wild-type animals. *, P < 0.05; **, P < 0.01; ***, P < 0.001. k/o, Knockout; wt, wild type.
