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4 levels
4 levels of protein structure
| Term | Definition |
|---|---|
| Primary | amino acid sequence |
| Secondary | pleated or twisted structure formed by hydrogen bonding between nonadjacent amino acids |
| tertiary | unique 3D folded shape of the protein |
| Quaternary | structure formed by some proteins when 2 or more polypeptide chains are connected to become 1 protein |