The genetic alphabet contains just 4 letters, referring to the 4 nucleotides, the building blocks that comprise all DNA. Scientists created artificial DNA using a 6 letter expanded system that was able to be recognized by enzymes that could be used to create never-before-seen proteins.

The genetic alphabet contains just 4 letters, referring to the 4 nucleotides, the building blocks that comprise all DNA. Scientists created artificial DNA using a 6 letter expanded system that was able to be recognized by enzymes that could be used to create never-before-seen proteins.