artificial dna

For billions of years, the history of life has been written with just four letters — A, T, C and G, the labels given to the DNA subunits contained in all organisms. That alphabet has just grown longer, researchers announce.
Potential uses of the technology include the incorporation of a toxic amino acid into a protein to ensure that it kills only
At first, nothing happened. The team scrambled to find out why, creating a genetic version of a computer proofreading program