Now, by the way, what happens if I take this molecule and place it, let's say somewhere here, where at this location, when it is to the right of the pi value, this molecule will tend to want to move back in this direction. And that's because anywhere in this region, this molecule will have a net negative charge. And so, because this negative charge will cause it to move this way, it will gravitate towards our pi value. And likewise, if we take this same tyrosine and place it within this region, in this region, it will have a net negative charge. And so, as a result of that electric field, it will gravitate and move towards this pi line. So if we place this here, it will move this way.