(a,b) Contrast test of the 3T3-L1 adipocytes and pancreatic mouse tissue, respectively, in main Fig. 1, scale bars: 100 µm. The units in the contrast bars are mV. The contrast profile of each cell at the indicated dashed lines (blue for lipids and green for proteins) is plotted in the lower part of a. Data in a,b are representative of five independent experiments.