This turn typically connects Beta sheets. The turn does not flip overthe beta sheets. 

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Turns are polypeptide sequences that connect secondary structures (i.e. alpha helices and beta sheets). There are two types of arrangements for turns: 
- Type I
- Type II

Protein Turns

Voet, D., Voet, J. G., & Pratt, C. W. (2013). Chapter 6: Proteins: Three-Dimensional Structure. In Fundamentals of biochemistry: Life at the molecular level (4th ed., pp. 127-175). Hoboken, NJ: Wiley. Retrieved January 05, 2021, from https://archive.org.

Fundamentals of biochemistry: Life at the molecular level, 4th edition: Chapter 6

Turns: Type I

This type of turn differs from the type II turn because it has a 180 degree flip due to two of the residues in the turn. 

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