Assertion: saliva's growth factor | /r/HasProperty | single chain polypeptide
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text: Epidermal growth factor (EGF), also known as epithelial growth factor, urogastrone-EGF, and (3-urogastrone, is a single chain polypeptide secreted by the submandibular salivary glands, duodenal Brunner's glands, small intestinal Paneth cells, and other exocrine glands including the pancreas .