Well, Christian used a ribonuclease, which is basically an enzyme of protein that catalyzes the breaking down of RNA molecules in the cells of organisms. And this particular protein has 124 amino acids in its primary sequence. And in the tertiary structure, it contains four individual disulfide bonds. So we have one bond between the 26th and the 84th 15 amino acid. We have a second bond between the we have a third bond between the 65th and 72nd, and we have the final bond between the 58th and 110th 15 amino acid in our ribonuclease. And this three dimensional structure, this confirmation basically describes the native confirmation of that ribonucleus.