The localization of amylase activity in the major salivary glands of adult male and female guinea pigs was determined by a substrate film technique. Parotid and submandibular glands showed intense activity localized to the acini. Only a weak reaction in the lumen of intralobular ducts was observed in sublingual glands. The sex differences in amylase activity reported in other commonly studied laboratory rodents were not detected in this species.
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