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Rope Chain: A rope chain's links are twisted or looped together in a pattern that creates a look similar to that of a rope. This is likely the most popular textural chain style. Byzantine Chain: Sometimes called birdcage or Etruscan, the Byzantine style is an obvious nod to the ancient Byzantine Empire.
Other types of secondary structure. While the a helix and b sheet are by far the most common types of structure, many others are possible. These include various loops, helices and irregular conformations. A single polypeptide chain may have different regions that take on different secondary structures.