The example of the proteoglycan. Now aggregate, what it does is it acts as a lubricant and it asks to actually absorb the shock. It absorbs and dissipates impact forces as we'll see in just a moment. So in the same analogous way that if we are in a car crash it's that airbag that acts to absorb the impact force. In this particular case, it's the aggregate that actually acts to absorb the impact force and prevent any type of damage to our tissue and to our body. So the collagen gives tensile strength, support and structure and the agriculture helps dissipate impact forces.