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A y-turn of Protein

Description
Only one residue is out of the hydrogen-bonding sequence.

In this case it is a proline, which cannot act as an H-bond donor in any case.

Note that no H atom is bonded to the a–amino group of the proline (the H that appears to be bonded to the a-N atom is, in fact, bonded to the d–carbon of the proline side chain).
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