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a,b) Darkfield microscopy of A-431 cells labeled with 40-nm Au particles (green arrows), 50-nm Fe3O4@Au core–shell particles (red arrows), and unlabeled cells (blue arrows); c,d) power spectra of labeled cells responding to modulation frequencies of 0.9 and 1.9 Hz, respectively; e,f) frequency-selected MM images.[50] Published with permission from the Optical Society of America.
