Well, the purpose is to give our tissue pliability, to give our tissue the ability to basically bend. So it makes our tissue flexible. And one common example is Carthage. For example, Carthage is found in the ears or our nose. And the reason we're able to bend our ears or nose without actually breaking it. The reason that our ears are so flexible is because of the proteoglycans and the glycos aminoglycan sound inside that cartilage tissue.