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A serous gland is a type of gland that produces a watery secretion containing proteins, such as the enzyme amylase. This is distinct from mucous glands, which secrete a thicker, clearer substance. In biology, secretion refers to the production and release of a useful substance by a gland or cell, or the substance itself. While many secretions are internal, some are external, like tears and sweat. Sebaceous glands, found in the skin, are an example of glands that secrete sebum, a mixture of lipids, through a process involving the disintegration of their cells.123

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