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A variety of enzymes were identified in rat tears and lacrimal gland fluid. The use of a tapered glass cannula in the opening of the excretory duct was found to be an useful method to collect samples of rat lacrimal gland fluid, i.e., the fluid directly originated from the main excretory duct of the lacrimal gland, uncontaminated by secretions from the Harderian gland and from desquamating conjunctival and corneal epithelial cells. Based upon comparison of the enzyme pattern in tears, lacrimal gland fluid and the lacrimal gland tissue, we concluded that the lacrimal gland is the primary tissue source for peroxidase (POD), amylase (AMY) and total protein in rat tears, while plasminogen activator and lactatedehydrogenase (LDH) may be present in tears primarily as secretion products from other ocular tissue sources. beta-hexosaminidase (beta-hex) is released from the lacrimal gland and from other ocular tissue sources as well.
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