Every living creature on Earth stores its genetic instructions using just four DNA letters.
These letters are known as A, T, C, and G.
Now researchers at UC San Diego have shown that DNA can work with four extra letters.
This creates a genetic alphabet with eight letters instead of four.
The team tested a key enzyme that copies and reads DNA inside the cell.
The enzyme was able to read the eight-letter code accurately.
Experts believe this could greatly increase how much data we can store in DNA.
It might also open the door to new kinds of medicine.