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(a) A two-dimensional magnetic map of a magnetically labeled DNA microarray obtained with an applied bias magnetic field, Bdc of 7.8 mT and a scan speed of 1.5 mm/s. Each circular dipole indicates a 100 μm diameter DNA spot, with the high background noise coming from the nonspecifically bound particles, and (b) Optical image of the same magnetically labeled DNA microarray showing the good correlation between the spot intensities in both magnetic and optical images.
