So Beter Mcappto ethanol uses an oxidation reduction reaction. So this itself is oxidized and reduces the disulfide bonds. It breaks them down. It breaks down the cysteine units into the two individual cysteine amino acids, as we'll see in just a moment. So together, these two agents can be used to denature to break down the tertiary and secondary structure of our protein. Now, the next question is, what protein did Christian actually use?