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The `secondary_structure` module: secondary structure restraints

The `secondary_structure` module provides classes to restrain secondary structure. Note that all of these restraints are simply added to the list of all restraints, and MODELLER will attempt to satisfy them as best it can, but their presence does not guarantee that the requested secondary structure will be adopted.

Subsections

- alpha() — make an α -helix
- strand() — make a β -strand
- sheet() — make a β -sheet