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#4. The R represents the side chain of the amino acids which make up the anti-parallel beta sheet. Since a wide variety of side chains can exist on a beta -sheet, they generalize the structure by writing Rs instead of specific amino acid side chains.
The R-group is a chemical group which gives the amino acid its distinctive properties. With amino acids, this chemical group is called the sidechain, and it specifies the amino acid. There are only 20 different amino acids found in proteins, each with itâs own defining sidechain. These sidechains have a widespread range of chemical and structural diversity. These would include: Aliphatic Amino Acids-they are hydrophobic.