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DNA is a molecule in almost every cell. It is a
long, spiral structure, like two threads wound around each other and
linked by chemical bridges. The sequence of these bridges is the genetic
code, which determines what the cell does. Your DNA is unique, like
your fingerprints. No other person or thing has the same as you. In
what other ways can you be identified? Your voice, your walk, your
mannerisms? Which of your personal traits do you prize most?
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