Supplementary Figure 1: Photographs of the 3D-MTC device and the confocal fluorescence microscopy.

I: The system consists of a Leica SP8-Confocal microscope (with an option of STED), a confocal PC, a 3D-MTC PC and a 3D-MTC; II to V: the steps of loading a cell-containing sample; VI: the current (magnetic field) control box for 3D-MTC.