Out of the following, which type of interaction is responsible for the stabilisation of α - helix structure of proteins?

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Hydrogen bonding is responsible for the stacking of $α -$ helix structure of protein.

The $α$ -helix structure of proteins is stabilized by intramolecular H-bonding between C−O of one amino acid residue and the N−H of the fourth amino acid residue in the chain.

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