Abstract
The shell gland of Scyliorhinus caniculus has been investigated histochemically and chromatographically. On the basis of histochemical reactions the gland is divided into five distinct regions, Zones A to E. These zones secrete respectively a carbohydrate, a carbohydrate substance which is metachromatic, a polyphenol oxidase, a protein, a phenol, and perhaps a phenolic protein and a basic protein.
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