10. Taylor A, Herrmann A, Moss D, Sée V, Davies K, Williams SR, Murray P. Assessing the Efficacy of Nano- and Micro-Sized Magnetic Particles as Contrast Agents for MRI Cell Tracking. PLoS ONE 2014; 9: e100259. DOI: 10.1371/journal.pone.0100259 11. Barrow M, Taylor A, Murray P, Rosseinsky MJ, Adams DJ. Design considerations for the synthesis of polymer coated iron oxide nanoparticles for stem cell labelling and tracking using MRI. Chemical Society Reviews 2015; 44: 6733-6748. DOI: 10.1039/C5CS00331H 12. Boyer C, Whittaker MR, Bulmus V, Liu J, Davis TP. The design and utility of polymer-stabilized iron-oxide nanoparticles for nanomedicine applications. NPG Asia Mater 2010; 2: 23-30. 13. Li L, Jiang W, Luo K, Song H, Lan F, Wu Y, Gu Z. Superparamagnetic Iron Oxide Nanoparticles as MRI contrast agents for Non-invasive Stem Cell Labeling and Tracking. Theranostics 2013; 3(8): 595-615. 14. Cortajarena AL, Ortega D, Ocampo SM, Gonzalez-García A, Couleaud P, Miranda R, Belda- Iniesta C, Ayuso-Sacido A. Engineering Iron Oxide Nanoparticles for Clinical Settings. Nanobiomedicine 2014; 1: 1-20. 15. Reddy LH, Arias JL, Nicolas J, Couvreur P. Magnetic nanoparticles: design and characterization, toxicity and biocompatibility, pharmaceutical and biomedical applications. Chem Rev 2012; 112: 5818-5878. DOI: 10.1021/cr300068p 16. Barrow M, Taylor A, Nieves DJ, Bogart LK, Mandal P, Collins CM, Moore LR, Chalmers JJ, Levy R, Williams SR, Murray P, Rosseinsky MJ, Adams DJ. Tailoring the surface charge of dextran- based polymer coated SPIONs for modulated stem cell uptake and MRI contrast. Biomaterials Science 2015; 3: 608-616. DOI: 10.1039/C5BM00011D 17. Liu G, Wang Z, Lu J, Xia C, Gao F, Gong Q, Song B, Zhao X, Shuai X, Chen X, Ai H, Gu Z. Low molecular weight alkyl-polycation wrapped magnetite nanoparticle clusters as MRI probes for stem cell labeling and in vivo imaging. Biomaterials 2011; 32: 528-537. DOI: http://dx.doi.org/10.1016/j.biomaterials.2010.08.099 18. Babič M, Horák D, Trchová M, Jendelová P, Glogarová K, Lesný P, Herynek V, Hájek M, Syková E. Poly(l-lysine)-Modified Iron Oxide Nanoparticles for Stem Cell Labeling. Bioconjugate Chemistry 2008; 19: 740-750. DOI: 10.1021/bc700410z 19. Jo J-i, Aoki I, Tabata Y. Design of iron oxide nanoparticles with different sizes and surface charges for simple and efficient labeling of mesenchymal stem cells. Journal of Controlled Release 2010; 142: 465-473. DOI: http://dx.doi.org/10.1016/j.jconrel.2009.11.014 20. Tassa C, Shaw SY, Weissleder R. Dextran-Coated Iron Oxide Nanoparticles: A Versatile Platform for Targeted Molecular Imaging, Molecular Diagnostics, and Therapy. Accounts of Chemical Research 2011; 44: 842-852. DOI: 10.1021/ar200084x 21. Calatayud MP, Sanz B, Raffa V, Riggio C, Ibarra MR, Goya GF. The effect of surface charge of functionalized Fe3O4 nanoparticles on protein adsorption and cell uptake. Biomaterials 2014; 35: 6389-6399. DOI: http://dx.doi.org/10.1016/j.biomaterials.2014.04.009 22. Docter D, Westmeier D, Markiewicz M, Stolte S, Knauer SK, Stauber RH. The nanoparticle biomolecule corona: lessons learned - challenge accepted? Chemical Society Reviews 2015; 44: 6094-6121. DOI: 10.1039/C5CS00217F 23. Basuki JS, Jacquemin A, Esser L, Li Y, Boyer C, Davis TP. A block copolymer-stabilized co- precipitation approach to magnetic iron oxide nanoparticles for potential use as MRI contrast agents. Polymer Chemistry 2014; 5: 2611-2620. DOI: 10.1039/c3py01778h 24. Freese C, Unger RE, Deller RC, Gibson MI, Brochhausen C, Klok H-A, Kirkpatrick CJ. Uptake of poly(2-hydroxypropylmethacrylamide)-coated gold nanoparticles in microvascular endothelial cells and transport across the blood-brain barrier. Biomaterials Science 2013; 1: 824-833. DOI: 10.1039/C3BM60050E 25. Molday RS, Mackenzie D. Immunospecific ferromagnetic iron-dextran reagents for the labeling and magnetic separation of cells. Journal of Immunological Methods 1982; 52: 353- 367. DOI: http://dx.doi.org/10.1016/0022-1759(82)90007-2