Amino acids can be classified as `alpha-,beta-,gamma-,delta`-and so depending upon the relative position of amino group with respect to carboxyl group. Which type of amino acids form polypeptide chain in proteins?

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`alpha` amino acid forms polypeptide chain by elimination of water molecules.
`alpha "amino acid" rarr R-overset(alpha)underset(" "NH_(2))underset(|)(CH)-COOH`
`nR-underset(" "NH_(2))underset(|)(CH)-COOHrarrH_(2)N-overset(R)overset(|)(C)H-underset("Peptide linkage")underset(uarr)((overset(O)overset(||)(C)-NH))-overset(R)overset(|)(C)H-COOH`

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