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Immunohistochemical analysis at the synovial site 7 days post implantation in the a chronic and b acute injury models. Blue staining (DAPI) represents cell nuclei whilst red fluorescence is significant of the DiI tag of implanted GET-Nanomag-labelled MSCs. Leukocytes, positive for the CD45 marker, are stained green with Prussian blue staining highlighting the magnetic nanoparticle, Nanomag, and is seen as the black staining in these monochrome images. Scale bars = 100 μm
