Polysaccharide Storage Myopathy: Blame It on the Genes

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A genetic mutation in an enzyme called muscle glycogen synthase might be responsible for polysaccharide storage myopathy (PSSM)--a debilitating and life-threatening disease in horses characterized by abnormally high glycogen (the storage form of glucose) levels in skeletal muscles.

PSSM is currently estimated to affect more than one-third of draft horses and one-tenth of all Quarter

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