Phenylalanine or Tyrosine Metabolism Disorder is a defect in breaking down or using these amino acids, leading to the buildup of harmful substances in the body and causing issues in the nervous system and growth, such as Phenylketonuria (PKU).

Serine or Glycine Metabolism Disorder is a defect in breaking down or using these amino acids, leading to the buildup of harmful substances in the body and causing issues in the nervous system and growth.

Gamma-Glutamyl Cycle Disorder is a defect in the metabolism of glutathione and related amino acids, leading to the buildup of harmful substances in the body and causing issues in the liver and nervous system.

Tryptophan Metabolism Disorder is a defect in breaking down or using the amino acid tryptophan, leading to the buildup of harmful substances in the body and causing issues in the nervous system and growth.

Urea Cycle and Ammonia Metabolism Disorder is a defect in converting toxic ammonia into urea, leading to the buildup of ammonia in the body and causing issues in the nervous system and growth.

Organic Acidemia is a group of metabolic disorders that cause the buildup of organic acids in the body, leading to issues in metabolism, the nervous system, and growth.