Laundry detergents take cues from the digestive system.
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Laundry detergents often contain several different classes of enzymes, including proteases, amylases and lipases. The human digestive system also contains such enzymes.
The digestive system also employs these types of enzymes to break down food. Proteases break down proteins, amylases break down carbohydrates and lipases break down fats. For example, your saliva contains both amylases and lipases, and your stomach and small intestine use proteases.