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Characterization of SPIONs (polymer/SPIO mass ratio = 0.6) and in vivo MRI of SPIO-labeled MSCs. (A) AFM height image; (B) TEM image of SPIONs nanoparticle clusters; (C) T2*-weighted gradient echo image shows a prominent hypointense area of labeled injection in the right frank (19 d after transplantation); (D) the ratios of signal intensities of the control and the labeled injection; reprinted with permission from ref. 65. Copyright (2011) Elsevier.
