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Phlegm
Phlegm ((ギリシア語:φλέγμα) "inflammation, humour caused by heat") is a liquid secreted by the mucous membranes of mammals. 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). Phlegm is in essence a water-based gel consisting of glycoproteins, immunoglobulins, lipids and other substances. Its composition varies depending on climate, genetics, and state of the immune system. Its color can vary from transparent to pale or dark yellow and green, from light to dark brown, and even to dark grey depending on the constituents.
==Distinction between mucus and phlegm==
Contrary to popular misconception and misuse, mucus and phlegm are not always the same.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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