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Representative examples of periodic acid Schiff (PAS) staining in genioglossus tissue sections from an adult (a) wild-type and (b) a sham-treated Gaa−/− mouse. The PAS reaction recognizes glycogen and is evident by the magenta coloring. Myofibers from the (b) sham-treated Gaa−/− mice are PAS-positive and have swollen vacuolar appearance with disruption of cellular architecture. Scale bars = 200 µm.
