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We demonstrate a fluorescent ultrasmall immunogold probe, FluoroNanogold (FNG), to be a versatile reporter system for immunocytochemical labeling of ultrathin cryosections. FNG-labeled molecules in the same ultrathin cryosections can be resolved by two imaging techniques (i.e., fluorescence and electron microscopy). Lactoferrin, a marker protein for the specific granules in human neutrophils, was employed as the target for FNG immunolabeling. The spatial resolution of the fluorescence signal from FNG-labeled specific granules was compatible with that of silver-enhanced gold signal from the same granules in electron microscopy. Our results confirm that FNG can be used as a probe for highresolution correlation between immunofluorescence and electron microscopy.

Correlative Microscopy Using FluoroNanogold on Ultrathin Cryosections: Proof of Principle