Abstract
Enzyme histochemistry has revealed that encapsulation reactions surrounding larvae of the nematode Angiostrongylus cantonensis 4 wk after infection of the gastropod Biomphalaria glabrata are the sites of highly localized acid phosphatase and nonspecific esterase activities. Lesser amounts of alkaline phosphatase and β-glucuronidase activities also occur within such capsules, but aminopeptidase activity cannot be demonstrated. In addition, it has been ascertained that acid phosphatase activity gradually increases as the encapsulation reaction progresses during the first to the fourth week postinfection.
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