The justification theory: the essential nature of the non-essential amino acids.
D000596:Amino Acids / Q000378:metabolism*; D004032:Diet; D006801:Humans; D008607:Intellectual Disability / Q000453:epidemiology; D007360:Intelligence; D010649:Phenylalanine / Q000378:metabolism / Q000627:therapeutic use; D010661:Phenylketonurias / Q000178:diet therapy / Q000235:genetics / Q000378:metabolism*; D014176:Protein Biosynthesis; D014443:Tyrosine / Q000378:metabolism / Q000627:therapeutic use; D014481:United States
D000596:Amino Acids; D014443:Tyrosine; D010649:Phenylalanine