Add Yahoo as a preferred source to see more of our stories on Google. The color of your mucus can reveal some surprising things about your health. (Photo: Getty Images) (Getty Images/iStockphoto) ...
John V. Fahy are at the Cardiovascular Research Institute, University of California, San Francisco, San Francisco, California 94143, USA, and in the Division of Pulmonary and Critical Care Medicine, ...
Narrator: Mucus production is something humans share with all mammals. It coats our reproductive and digestive tracts, as well any wet surfaces exposed to the outside world like our eyes and nostrils.
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