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Sepiapterin reductase deficiency (SR) is a rare inborn disorder of neurotransmitter metabolism. The early diagnosis of SR disease should be achieved through the determination of the sepiapterin level in body fluids of suspected patients. Here, we report the selection, identification, and characterization of DNA aptamers against sepiapterin. The aptamer selection was achieved via the systematic evolution of ligand by the exponential enrichment technique. After ten rounds of selection, high-affinity aptamers were identified. The binding