The addition of sodium bisulfite to uracil and to cytosine.
D055598:Chemical Phenomena; D002621:Chemistry; D003596:Cytosine; D009682:Magnetic Resonance Spectroscopy; D013447:Sulfites; D013451:Sulfonic Acids; D014498:Uracil
D013447:Sulfites; D013451:Sulfonic Acids; D014498:Uracil; D003596:Cytosine