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Interactions that occur between polypeptide backbones.
Protein secondary structure includes what are known as alpha helices, beta pleated sheets, and other less typical protein structures:
"Four secondary structures—alpha-helices, beta-sheets, reverse turns and omega-loops—make up more than 90 percent of the conformational structure of all proteins." — George D. Rose, 1996, No assembly required, The Sciences 36(1):26-31.
In addition to protein secondary structure, see also protein primary structure, protein tertiary structure, and protein quaternary structure.
Protein secondary structure involves primarily hydrogen bonding between the non-R-group portion of polypeptides.
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