A deficiency of AS (citrullinemia), the third enzyme in the urea cycle is inherited as an autosomal recessive trait.1 The prevalence has been estimated as approximately one in 100 000.2 A ...

Department of Biochemistry, Faculty of Medicine, Kagoshima University, 8-35-1 Sakuragaoka, Kagoshima 890-8520, Japan Tel. +81-99-275-5242; Fax +81-99-264-6274 e-mail: [email protected] ...