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  1. What Are Proteins? Definition, Types & Examples - Cleveland Clinic

    Jun 24, 2025 · Proteins are molecules made of amino acids that send signals between cells, support digestion, help your muscles move and protect you from infection.

  2. Protein: What It Is, Types, Uses, Needs, Deficiency

    Oct 11, 2025 · Proteins are large molecules made up of chains of amino acids that are important for cell function, tissue structure, and body regulation. Most people in the U.S. consume more …

  3. Protein | Definition, Structure, & Classification | Britannica

    Nov 29, 2025 · A protein is a naturally occurring, extremely complex substance that consists of amino acid residues joined by peptide bonds. Proteins are present in all living organisms and …

  4. Protein - The Nutrition Source

    Protein is made from twenty-plus basic building blocks called amino acids. Because we don’t store amino acids, our bodies make them in two different ways: either from scratch, or by …

  5. Protein - Wikipedia

    Proteins are large biomolecules and macromolecules that comprise one or more long chains of amino acid residues.

  6. What Are Proteins? Protein Definition, Functions, Examples

    Dec 13, 2017 · Proteins are a large class of biomolecules and macromolecules consisting of chains of amino acids called polypeptides. While simple proteins consist of a single …

  7. What are proteins and what do they do?: MedlinePlus Genetics

    Mar 26, 2021 · Proteins are made up of hundreds or thousands of smaller units called amino acids, which are attached to one another in long chains. There are 20 different types of amino …

  8. What is a Protein? Exploring Its Structure, Function, and …

    Apr 18, 2025 · Proteins are the functional molecules in biology. They serve a vast array of roles, from catalyzing biochemical reactions to forming the structural components of cells.

  9. What Is Protein and What Does It Do for Your Body?

    Jul 26, 2025 · Protein is a macronutrient the body needs in large amounts for energy, structure, and system maintenance. It is involved in nearly every bodily process, from cellular function to …

  10. What Protein Does for Your Body and If You're Getting Enough

    May 14, 2025 · Proteins are made up of amino acids and are found in every cell of the body. Protein is essential for bone, muscle, digestive and metabolic health. For optimal health, enjoy …