So aspartate refers to our amino acid form that exists in the physiological PH of around seven. So this, in its deprotonated form, is known as aspartate. But if we protonate this, then it's called aspartic acid. And likewise, in its deprotonated state, we call it glutamate. But in its protonated state, we call it glutamic acid. So these are the two acidic amino acid acids, while the other two, or the other three, are basic amino acids.