CDO1 (Cysteine Dioxygenase Type 1): CDO1 is an enzyme that helps convert cysteine into cysteine sulfinic acid, an essential step in the metabolism of sulfur-containing amino acids. This process is crucial for regulating cellular cysteine levels and aiding the production of taurine and sulfate. Proper functioning of CDO1 is vital for maintaining cellular redox balance, and abnormalities in this enzyme have been linked to various health conditions, including cancer, due to cysteine’s role in cell growth and programmed cell death.