Displaying 9 results of Cytosine Stable Isotopes Cytosine stable isotopes are non-radioactive forms of the cytosine molecule that have a stable atomic mass. These isotopes are commonly used in scientific research to study cellular processes and DNA replication. They can be labeled with stable isotopes such as carbon-13 and nitrogen-15, which can be tracked using mass spectrometry. This allows researchers to gain a better understanding of the mechanisms behind cellular processes and the role that DNA plays in disease.