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Optical microscopy photograph of hard tissue biopsy of M2 and HA coating after toluidine-blue surface staining (×200). a1-a3 show the results of experimental group implanted for 1, 2 and 3 months, and b1-b3 are for HA coating group harvested at 1, 2 and 3 months, resepectively. Fig. a3-PL and b3-PL are labeled by tetracycline and calcein at 3 months.
