 signal. They dock at a cell called the chondrocyte, which is our cartilage-making cell. There's only one type of cell that can make cartilage. It's called a chondrocyte. They dock at the chondrocyte like a lock and key, and they signal to the chondrocyte to actually start producing more cartilage faster. It's like putting the factory on 24-7. You just go make more cartilage.