-S-S- bonds are found in which structure of proteins.
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Solution
-S-S- is called disulphide bond which is found in the tertiary structure of the protein.
These disulphide bonds are strong, covalent bonds that help stabilize the structure of proteins and prevent them from becoming denatured in the extracellular environment.
A covalent bond is formed between two sulfur atoms on the two cysteine amino acid in the peptide chain.