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Abstract
Stiff-person syndrome (SPS) is a rare autoimmune neurological disorder characterized by progressive axial muscle stiffness, central nervous system hyper-excitability, and painful stimulus-sensitive muscle spasms. SPS is classified into classic SPS and SPS variants, including stiff-limb syndrome (SLS) and progressive encephalomyelitis with rigidity and myoclonus (PERM), based on clinical presentation. SPS responds to immunotherapy, and several autoantigens have been identified. Most patients with SPS have high-titers of antibodies against glutamic acid decarboxylase (GAD), the rate-limiting enzyme for the synthesis of γ-aminobutyric acid (GABA), and up to 15% of the patients have antibodies against the glycine receptor α-subunit.
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