DNA (Deoxyribonucleic acid) is the genetic material in every cell of the body including blood, saliva, skin and hair. Everyone has DNA. We inherit our DNA from our parents. A gene is a section of DNA that contains the information our bodies need to make chemicals called proteins. In this way, they tell your cells how to function and what characteristics to express, and thus influence what we look like on the outside and how we work on the inside. For example, one gene contains the code to make a protein called insulin, which plays an important role in helping your body control the amount of sugar in your blood.