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What characterizes the secondary structure of proteins?

1.	It is the sequence of amino acids in a polypeptide chain.
2.	It includes α-helices and β-pleated sheets formed by hydrogen bonds.
3.	It represents the overall three-dimensional structure of a single polypeptide.
4.	It involves interactions between different polypeptide chains or subunits.

Subtopic: Structural Organisation of Proteins |

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