The developers of the system call each of these potentially modifiable spots on the template an epi-bit, where modifications correspond to 1s, and unmodified versions correspond to 0s.
Using this system, Zhang et al. created five DNA templates and 175 bricks to record 350 bits at a time, successfully storing and reading nearly 275,000 bits.
There are still errors in the printing and reading steps, and since these modifications don't survive DNA copying, making additional versions of stored information could be complicated.
Once these problems are solved and technology is further optimized, it could provide a novel way to harness natural data storage methods.
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