Polysaccharide Storage Myopathy (PSSM): A Genetic Diagnosis, AAEP 2008

Polysaccharide storage myopathy (PSSM) is a metabolic muscle problem found in at least 20 breeds, including Quarter Horses, Paints, Appaloosas, and drafts. An affected horse suffers bouts of exertional rhabdomyolysis (tying-up), muscle tremors, and/or gait abnormalities.

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