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In-vitro hydroxyapatite formation of HMBGNs; (a,b) SEM images of 1CaHMBGNs and 2CaHMBGNs after immersion in SBF for seven days; (c) XRD patterns of HMBGNs after immersion in SBF for seven days. The marked peaks at 2θ = 31.9°, 34.5°, and 45.6° corresponded to HA peaks (JCPD 84-1998) [24].
