Colour development of immunogold-labelled antibodies for light microscopy

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Abstract
We describe an improvement of the immunogold technique, which is based on the colour development of silver-intensified immunogold signals. This method (referred to as the coloured-SIG technique) was found to be as sensitive as the silver-intensified immunogold method and more sensitive (in two of the three tested systems) than immunoenzymatic procedures, such as the peroxidase/antiperoxidase technique or the avidin-biotin system. The coloured SIG-method results in either a magneta-red or a cyan-blue final reaction product. Therefore, this new improvement of the immunogold technique should be useful in (1) double-staining methods, (2) immunoblot methods and (3) conventional immunostaining methods.

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