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FESEM images and XRD spectra of MBG_Sr_SD after different time of soaking in SBF: (a) MBG_Sr2%_SD after 1 day; (b) MBG_Sr2%_SD after 3 days; (c) MBG_Sr2%_SD after 7 days; (d) MBG_Sr4%_SD after 1 day; (e) MBG_Sr4%_SD after 3 days; (f) MBG_Sr4%_SD after 7 days.
