A novel technique combining the freeze drying and embedding in glycol methacrylate at low temperature of tissue permitted the histochemical demonstration of a variety of enzymes, showing maintenance of enzyme activity, accurate enzyme localisation without apparent diffusion, and excellent morphological detail. The results obtained with this new approach were superior to standard techniques used for both enzyme histochemical and morphological studies. Moreover, blocks of the embedded tissue were stored for at least one year at room temperature without loss of enzyme activity. This method should find a wide range of applications in histopathology.
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