title: In response to van Spronsen et al (2009) phenylalanine tolerance can already reliably be assessed at the age of 2 years in patients with PKU (J Inherit Metab Dis 32: 27-31).
authors.forename: Alberto
authors.initials: A
authors.lastname: Ponzone
authors.forename: Alessandro
authors.initials: A
authors.lastname: Mussa
authors.forename: Francesco
authors.initials: F
authors.lastname: Porta
mesh_terms: D000367:Age Factors; D002675:Child, Preschool; D004361:Drug Tolerance; D006801:Humans; D010649:Phenylalanine / Q000097:blood / Q000627:therapeutic use*; D010651:Phenylalanine Hydroxylase / Q000172:deficiency / Q000235:genetics; D010661:Phenylketonurias / Q000097:blood / Q000175:diagnosis* / Q000188:drug therapy*; D011379:Prognosis; D015203:Reproducibility of Results; D016896:Treatment Outcome
chemical_list: D010649:Phenylalanine; D010651:Phenylalanine Hydroxylase