Clicking will reset the position of the cells to their original coordinates
Spheres that are in a cell membrane will not attract spheres inside the cell
Revert "Spheres that are in a cell membrane will not attract spheres inside the cell"

This reverts commit 99718590995ce7bce4fc8c4375c49ba4502f0dbd.
Spheres that are in a cell membrane will not attract spheres inside the cell

This is so that spheres do not end up clustering inescapably at the
cell membrane.