Question: what is pssm type 1?
Answer: Polysaccharide Storage Myopathy, Type 1. Polysaccharide Storage Myopathy (PSSM) is an inherited muscle disease that affects many and diverse breeds of horses. ... This mutation results in the accumulation of abnormal complex sugars within skeletal muscle of horses. This form of PSSM is termed Type 1 PSSM.