Unless the dermis, the layer below the epidermis, which contains blood vessels and nerves, is regenerated, it cannot be considered normal living skin. Now, work by Swedish researchers may have brought medicine closer to being able to regenerate living skin. They have developed two types of 3D bioprinting techniques to artificially generate thick skin that is vascularized, meaning it contains blood vessels. One technique produces skin that is packed with cells, and the other produces arbitrarily shaped blood vessels in the tissue. Blood vessels play an extremely important role in the construction of artificial tissues.