DNA is the thread of life. Encoded in its genetic sequence is the information that makes each of us unique. This activity allows you to see the long, stringy strands of your own DNA, extracted from your cheek cells. This is a simplified version of the same technique routinely used by research scientists to isolate DNA. One word of caution, however, saliva is used in this activity, so all tubes, tips and cups should be disinfected either by autoclaving or rinsing in a 10% bleach solution.