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Paraffin wax embedding methods suitable for demonstrating the distribution of enzyme activity in tissues sections are uncommon; most procedures rely on the use of frozen section techniques. This paper describes a system for demonstrating certain enzymes which involves incubation of the tissue with appropriate substrates before a Paramat wax embedding procedure. While it has distinct merits of its own, the procedure is eminently suitable for use where a cryostat is not available; it can also be readily applied to other enzymes and tissues.

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