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In labial minor salivary glands of the dog, mucous (m) tubules dominated over serous (s) acini or demilunes (A, B). The excretory intralobular ducts (asterisk) were lined with cuboidal epithelium. Groups or patches of simple columnar epithelial cell with basal striation (arrows) were frequently present within small interlobular secretory ducts (triangles). The secretion is composed of PAS positive neutral and Alcian blue positive acid mucopolysaccharides (C, D)
