Guanidinoacetate methyltransferase (GAMT) deficiency is a rare autosomal recessive disorder of creatine biosynthesis. Here. we report 9 and 10-year-old cousins with GAMT deficiency caused by a novel mutation who both exhibited neurodevelopmental retardation. seizures. https://www.sukrensi.com/flash-sale-Ribavirin-500MG-R0077-500MG-p9633-big-savings/