Phlegm
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Phlegm is a sticky fluid secreted by the mucous membranes of humans and other animals. Its definition is limited to the mucus produced by the respiratory system, excluding that from the nasal passages, and particularly that which is expelled by coughing (sputum). Its composition varies, depending on climate, genetics, and state of the immune system, but basically is a water-based gel consisting of glycoproteins, immunoglobulins, lipids, etc. Phlegm may be of several different colors.
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