Abstract
A new retrograde tracer, rhodamine latex microspheres, permits labeled neurons to be visualized with fluorescence light microscopy. However, their use has been limited to the light microscope. We now have developed colloidal gold fluorescent microspheres which identify retrogradely labeled neurons first by fluorescence microscopy and then by electron microscopy. This new fluorescent/EM tracer will find widespread use in the field of neuroscience to elucidate the ultrastructural integrity of neuronal networks.
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