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(A) Constant-current image of fragments of DNA specimen in humid air (80% RH at 25°C). The DNA specimen was deposited on a TE buffer-treated mica substrate. Image was taken with a sharp W tip at a reference current of 0.3 pA and a tip bias of 3 V. The tip raster rate was 0.25 Hz. (B) A high-resolution image of a DNA molecule obtained by scanning over a smaller area.
