title: A study of plasma free amino acid levels. 8. The relationship between plasma amino acid levels and I.Q. test performance.
mesh_terms: D000293:Adolescent; D000367:Age Factors; D000596:Amino Acids / Q000097:blood*; D002648:Child; D005260:Female; D005998:Glycine / Q000097:blood; D006801:Humans; D007360:Intelligence; D007361:Intelligence Tests; D008297:Male; D012737:Sex Factors; D014364:Tryptophan / Q000097:blood
chemical_list: D000596:Amino Acids; D014364:Tryptophan; D005998:Glycine