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The tryptophan-kynurenine pathway functions as a stress-activated metabolic system that diverts tryptophan from serotonin synthesis toward kynurenic acid production, which acts as a glutamate receptor antagonist and may contribute to anxiety pathophysiology through altered glutamatergic neurotransmission (Butler et al., 2022)
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This type typically manifests in early childhood and is characterized by progressive muscle weakness and wasting, leading to difficulties with mobility and motor functions
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