title: The use of Opalina sudafricana in a biological test for diagnosing disordered metabolism of tryptophan in human subjects.
mesh_terms: D000724:Ancylostomiasis / Q000652:urine; D000818:Animals; D001196:Ascariasis / Q000652:urine; D001681:Biological Assay / Q000379:methods*; D002025:Bufonidae / Q000469:parasitology; D016798:Ciliophora / Q000254:growth & development / Q000502:physiology*; D003470:Culture Media; D005260:Female; D006801:Humans; D008297:Male; D012552:Schistosomiasis / Q000652:urine; D014364:Tryptophan / Q000652:urine*; D001749:Urinary Bladder Neoplasms / Q000652:urine
chemical_list: D003470:Culture Media; D014364:Tryptophan