This has a negative charge. And so what? That means this entire amino acid will be negatively charged as a result of this fact. And so this is a positively charged amino acid, and that is found in a very low PH, in a PH of around one. Now, in the middle, we have this zvitarion form. And at this end, when we are above a PH of nine, when it's very basic, we have a negatively charged species, as shown in the following diagram.