Abstract
Retinal whole mounts, brain sections, and astrocyte cultures were labeled with various fluorescent markers. Tissues or cells were then irradiated by light in the presence of diaminobenzidine. Irradiation initiated a reaction in which specific fluorescent labeling was replaced by an insoluble diaminobenzidine product. The diaminobenzidine product is more stable than the original fluorescent labeling and can be processed for electron microscopy. In some cases, the reaction product reveals cellular detail that cannot be resolved in the fluorescent labeling. The 10 fluorescent markers tested have widely differing structures, span a broad range of wavelengths, and label several different cellular elements. The photoconversion reaction was successful with all markers and tissues tested.
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