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. 

Grand Valley State University

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

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

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