Figure 2. Observation of untreated 4T1E/EM3 cells in the medium using SE-ADM system.

(a) Dielectric image of untreated culture cells in medium at 2,500× magnification, with a 7-kV EB and −32-V bias. ERs are visible as a complex membrane stack in the lower left (boxed region). (b) Dielectric image near the nuclear regions. The membrane and vesicle structure are shown at the lower left. Many vesicles are dispersed throughout the regions. The image was obtained with a 9-kV EB, 4,000× magnification and −32-V bias. (c) Dielectric image of other membrane and vesicle structure regions obtained at 8 kV and 2,500× magnification. All scale bars represent 5 μm.