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Fluorescent bone labeling results of the regeneration subchondral bone after 12 weeks of implantation. (a) The overlay images of three fluorescent formation markers; (b) calcein, (c) tetracycline, (d) alizarin; and (e–h) the quantitative results of their fluorescence densities. ∗p < 0.05, ∗∗p < 0.01; n = 3.
