In this case, we have a very polar, hydrophilic side chain group because we have those full positive charges. And so at the normal physiological PH, these two amino acids will be able to form ionic bonds, but this one will act as a very hydrophobic molecule. And so it will be found inside that protein structure. Because usually on the outside, we have the polar water molecules, and this will observe the hydrophobic effect and will tend to interact with the non polar side chains found inside that protein. So these are the seven ionizable amino acids. It's ionizable because they have these side chain groups that can lose or gain h atoms at specific PH values.