Now let's discuss the five remaining amino acids. And the special thing about these these five remaining amino acids is they all contain a full charge on their side chain groups at the normal physiological PH. And that's exactly what makes them very highly hydrophilic, because they have that full charge. Now, Lysine, Arginine, and histidine are basic amino acids. And what that means is their side chain groups at the normal physiological PH bears a full positive charge. On the other hand, aspartate and glutamate are the two acidic amino acids.