Displaying 8 results of Cytosine Impurities Cytosine impurities refer to any foreign substances that may be present in a sample of cytosine, a nucleotide base that is essential to the structure of DNA and RNA molecules. These impurities can negatively affect the quality and accuracy of scientific research, as well as the safety of medical treatments that rely on cytosine. Therefore, it is important to identify and remove cytosine impurities before using this molecule in any applications.