It basically confirms the theory discussed in this thread: https://news.ycombinator.com/item?id=36785816 https://news.ycombinator.com/item?id=36785816 In laym

It basically confirms the theory discussed in this thread: https://news.ycombinator.com/item?id=36785816 https://news.ycombinator.com/item?id=36785816 In layman's terms, they're using achilles or tail tendon from certain kangaroo species that have been carefully dissected to retain only non-immune-reactive tissue (or decellularized), and sticking it in people's knees and other ligament sites in the body because it's strong.