So we're at a low temperature. What begins to happen as we actually increase that temperature? Well, as we increase the temperature, we're essentially transferring kinetic energy to the molecules, the lipids and the proteins within that membrane. And so these phospholipids basically move with a greater velocity. And because they move with a greater velocity, those intermolecular bonds that are holding that rigid structure, the well defined and order structure, basically cannot maintain that rigidity any longer. And eventually, what happens is at a specific temperature called the melting temperature, there's a phase transition that takes place.