“Researchers around the world are working to grow heart valves, lungs and more from human cells. They have succeeded in bringing some to market such as knee cartilage and skin grafts, but advances for more complicated anatomy have been slow-going for years. 

Now scientists are gaining ground in tissue engineering that could help a host of people who deal with circulatory-system problems.

One of the companies furthest along is Humacyte, a Durham, N.C.-based biotech that makes lab-grown blood vessels, which could help patients with traumatic injuries along with those who use catheters for dialysis or suffer pain from narrowed circulation to the limbs.”

From Wall Street Journal.