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Your genome, every human's genome, consists of a unique DNA sequence of A's, T's, C's and G's that tell your cells how to operate. Thanks to technological advances, scientists are now able to know the sequence of letters that makes up an individual genome relatively quickly and inexpensively. Mark J. Kiel takes an indepth look at the science behind the sequence.

Lesson by Mark J. Kiel, animation by Marc Christoforidis.