And when the bronchi no longer have cartilage around them, they're no longer rigid.

And then a few weeks later we can take out the cartilage scaffold.

So that's why it needs to have some rigidity so that's why it has cartilage around it.

We would then take that regeneration template and insert it into the missing meniscus cartilage to regrow that in a patient's knee.

The middle yellowish layer is dense with agents that are believed to stop an arthritic agent known as interleukin 1, which causes degeneration of the joints and the breakdown of cartilage.