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residues (labelled i, i+1, i+2 and i+3). They can be defined in two ways:

# By the possession of an intra-main-chain hydrogen bond between the CO of residue i and the NH of residue i+3;
# By having a distance of less than 7Å between the C? atoms of residues i and i+3.

The hydrogen bond criterion is the one most appropriate for everyday use, partly because it

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