Which one is imino acid?

Pepsin

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Proline

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Cysteine

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Renin

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Solution

The correct option is B Proline
An imino acid is a compound that has an imino (C = NH) group and a carboxylic acid (-C(=O)-OH) functional group.
An imino group is formed when nitrogen is double bonded to its carbon atom and single bonded to either a hydrogen atom or $s p^{3}$ hybridised carbon atom.
Hence, in proline and hydroxy proline, instead of an amino group ( $- {NH}_{2}$ ), an imino group $(- NH)$ is present.

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