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Globular protein
Globular proteins are compact, spherical proteins that are typically soluble in water. Their structure results from the folding of the polypeptide chain into a tightly packed three-dimensional shape.
R-group
The variable side chain attached to the central carbon of an amino acid. The R-group determines the chemical properties of each amino acid and is the only part of the structure that differs between the 20 amino acids used in proteins.