Fig. 2

MFMNPs behavior inside the cells in a constant magnetic field exposure. a Light microscopy micrograph of cells incubated with MFMNPs for 24 h, then placed in magnetic field for 16 h and embedded in epoxy resin. Small blue lines repeat the arrangement of MFMNPs inside the cells in magnetic field; black lines, reconstructed on the basis of blue lines, demonstrate the magnetic field lines around the permanent magnet. b–g Correlative light-electron microscopy of the cell, marked with red oval on the panel a, with Alexa Fluor 647 labeled MFMNPs inside: b phase-contrast microscopy, c confocal microscopy, d–g TEM images