CBS (Cystathionine beta-synthase): CBS is an enzyme essential for sulphur metabolism, playing a key role in converting homocysteine to cysteine. This process supports the production of glutathione, an important antioxidant for protecting cells against oxidative stress. CBS also participates in the transsulphuration pathway, which regulates sulphur-containing amino acids and hydrogen sulphide, a signalling molecule involved in various physiological functions. Proper CBS activity is important for maintaining cellular redox balance, vascular function, and neurotransmitter regulation. Dysregulation of CBS is linked to metabolic disorders such as homocystinuria and cardiovascular diseases.