Abstract
The end organ of Proteocephalus ambloplitis pleroceroids was studied by light microscopy and histochemistry. The end organ consists of a spherical sac filled with an amorphous, granular secretory product. The lining of the end organ is devoid of an epithelial cell layer. Protease was detected within the end organ by a gelatin-silver film technique. No aminopeptidase activity was detected. The end organ was PAS positive and diastase-fast. A positive test was obtained for neutral mucopolysaccharides and protein. The end organ is thought to assist migration of larvae through host tissue.
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