Now, these interactions are inter molecular interactions. What about intramolecular interactions? So we also have a specific type of intramlecular interaction, a covalent bond that can also dictate that tertiary structure. And these are known as disulfide bridges or disulfide bonds. So it turns out that if we have 215 amino acids that are in close proximity, if an oxidation reaction takes place, we can form a covalent bond between our sulfur groups. So basically, an oxidation reaction takes place.