Pygm is a symbol for the gene, Phosphorylase, glycogen, muscle, in humans. Other names include: Glycogen phosphorylase, muscle form; Glycogen phosphorylase, muscle form ; Myophosphorylase; McArdle syndrome; glycogen storage disease type V. The encoded protein is an enzyme with an amino acid length of 842 and a mass of 97.1 kDa. Other isoforms may exist. Pygm is a member of the Glycogen phosphorylase family. This gene shares homology with other species, including: Mouse, Rat, Frog.