Every cell that's ever lived has been the result of the four-letter
genetic alphabet: A, T, C and G -- the basic units of DNA. But now
that's changed. In a visionary talk, synthetic biologist Floyd E.
Romesberg introduces us to the first living organisms created with
six-letter DNA -- the four natural letters plus two new man-made ones, X
and Y -- and explores how this breakthrough could challenge our basic
understanding of nature's design.
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