... or cysteine. The logarithmic values of the activity ratios increase linearly with blood lead concentrations. The increase in ALA-D activity brought about by the addition of zinc or cysteine can be used to identify cases of low enzyme activity with no lead intoxication involved. The same technique can also...

...J.E. Smith; Kateri Moore; P.G. Board Glutathione is synthesized from γ-glutamylcysteine and glycine via the action of glutathione synthetase. It is known that γ-glutamylcyclotransferase is present in many cells and may convert γ-glutamylcysteine to 5-oxoproline and cysteine, but until now there has...

...K. Snell Homoserine dehydratase activity is a measure of cystathionase, an enzyme which catalyses the last step leading to cysteine formation in the transsulphuration pathway. The enzyme develops rapidly in fetal rat liver starting on the 20th day of gestation and reaches its adult level on the 2nd...