APA Dictionary of Psychology

an autosomal recessive metabolic disorder caused by mutations in the SLC7A7 gene and characterized by the body’s inability to digest and use the amino acids lysine, arginine, and ornithine. Symptoms usually develop after infants begin to eat solid foods. Early signs include nausea and vomiting after ingestion of protein-rich foods. Enlarged liver and spleen, short stature, muscle weakness, osteoporosis, and a life-threatening lung disorder are also associated with this condition.