Chemistry of Life, The Journey of a Carbon Atom
As a finalized protein you can do many things like, build and repair tissues, make enzymes, hormones, other body chemicals, and so much more.
Image (http://www.interactive-biology.com/wp-content/uploads/2012/05/Human-Insulin-Protein-Structure-917x1024.jpg)
Image (http://www.interactive-biology.com/wp-content/uploads/2012/05/Human-Insulin-Protein-Structure-917x1024.jpg)