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Simplified definition

A component found in the cells of all living beings and that is responsible for the good functioning of the body and cellular processes.

Source: Houria Aiouaz, for Alzheimer Foundation

Referenced definition

“Proteins are polymers of amino acids linked via α-peptide bonds.”

Source: Watford M, Wu G. Protein. Advances in Nutrition. 2018;9(5):651-653.


“The collection of proteins within a cell determines its health and function. Proteins are responsible for nearly every task of cellular life, including cell shape and inner organization, product manufacture and waste cleanup, and routine maintenance. Proteins also receive signals from outside the cell and mobilize intracellular response. They are the workhorse macromolecules of the cell and are as diverse as the functions they serve.”

Source: Scitable. Protein function. [Internet]. [cited on July 18, 2023].


  • Some proteins are made by the body while others are needed and found in food.
  • Proteins constitute our body and are the “building blocks” of our cells.
  • Proteins repair and build bones, muscles, skin, hair, and nails.
  • A small protein is called a “peptide”, a word often used to talk about amyloid-beta protein.



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