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(A) T2-weighted magnetic resonance imaging (MRI) images of hydroxyapatite (HA) (commerce), DC-CoHA, PC1-CoHA and PC2-CoHA suspended in gelatinat at different concentrations; (B) the T2 relaxation rate R2 (1/T2) against cobalt concentration of CoHA; (C) relaxivity coefficient (r2) and saturation magnetization (Ms) of the relative relationship.
