# The radical possibilities of man-made DNA | Floyd E. Romesberg

An episode of [TED Talks Science and Medicine](https://invisiblenetwork.ai/podcast/470623801), 26 Nov 2018, 14 min.

Audio: https://download.ted.com/products/89130.mp4?apikey=172BB350-0011

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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