Scientists identify seventh and eighth bases of DNA
Short of it is that two more versions of cytosine are confirmed.
Little longer of it is that this is another step in the process to convert 5-methylcytosine (methylated cytosine) back to cytosine. This has implications for stem cell research because we could possibly remove methylation in an individual's differentiated stem cells (for use in research as an alternative to embryonic stem cells or it can be used for manufacturing individually tailored treatments), and also big implications for cancer treatment because you could possibly reactivate silenced tumor regulator genes.