Fig. 2

a Percentage of iron internalized in U87-Luc cells measured by ICP-AES, when these cells were brought into contact with 700 µg/ml of CM during 24 h, and either not subjected to one MS (w/o MS) or subjected to one MS (with MS). In the inset of a, optical microscopy images of cells brought into contact with CM and stained with Prussian blue. b, c TEM images and associated size histogram estimated on 150 magnetosomes of magnetosomes internalized in U87-Luc cells, within an intracellular vesicle, following the treatment described in a. d Percentage of living cells measured following a treatment in which U87-Luc cells were brought into contact with 700 µg/ml of CM during 24 h and either no exposed to one MS (W/o MS) or exposed to one MS (With 1 MS). The MS consisted in the application of an AMF of 198 kHz and 27 mT during 30 min