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AbstractNeu Laxova syndrome (NLS) is a rare and lethal congenital disorder characterized by severe intra‐uterine growth retardation (IUGR), ichthyosis, abnormal facial features, limb abnormalities with arthrogryposis and a wide spectrum of severe malformations of the central nervous system (CNS). NLS is due to biallelic variants in three genes previously involved in serine‐deficiency disorders (PHGDH, PSAT1 and PSPH), extending the phenotypic spectrum of these disorders.