So tear production basically involves being able to release the water very, very quickly. And the same thing is true for producing saliva. And so those cells of our body actually use aquaphorns to release the water as quickly as possible. And the rates at which that takes place the water travels through these aquaporeans are much higher than the rates at which the water actually moves through that membrane. Another example are red blood cells. So red blood cells actually contain a high concentration of aquaporeans in their membrane.