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  1. Proteins and Polypeptides: basics, structures, properties

  2. High Protein Foods: 16 Foods for High Protein Meals - Healthline

  3. Protein: What It Is, Types, Uses, Needs, Deficiency - Verywell Health

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

  5. Protein – The Nutrition Source

  6. Protein: Why Your Body Needs It - WebMD

  7. Protein - Wikipedia

  8. 9 Important Functions of Protein in Your Body - Healthline

  9. Here’s What Protein Does: 5 Functions and Examples - Verywell …

  10. What Is Protein? A Complete Scientific Guide - Everyday Health