<prompt> Which glycogen storage disease does not affect muscles?Type 1Type 2Type 3Type 4  <response>: a. Type 1Ref: Nelsons 20e p 715-725, Ghai 8e p 655-657Type 2 Pompe disease predominantly involves muscles, while type I GSD involves liver.Although type 2 and type 3 GSD are predominantly liver glycogenoses, skeletal muscle involvement may also be seen. 