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. 2015 Sep 2;5:13628. doi: 10.1038/srep13628

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(a) Perl’s Prussian blue (PPB) staining of stem cells labelled with various concentrations of BNF nanoparticles for various periods of time, followed by incubation with GdDTPA (30 mM) for 18 h. (b) BNF labelling efficiency in dual magnetically labelled cells determined by light microscopy (n = 3; P < 0.05).