The main structural proteins are collagen and elastin.

Before this, however, artificial skin was grown using materials like collagen.

There are many different types of collagen protein in each of the body's tissues.

These fibroblasts secrete collagen, which interacts with fibers on the surfaces of adjacent bone and cementum.

All we are left with is the skeleton, if you will, of the liver, all made up of collagen, a material that's in our bodies, that will not reject.

These tissues form a framework, or matrix, for the body, and are composed of two major structural protein molecules collagen and elastin.

These fibers may then be coated with collagen to promote cell attachment, although collagen has successfully been spun directly into membranes.