Wnt Proteins as Key Nerotrophic Factor (IMAGE) Umea University Caption Wnt7a (top) and dystrophin (middle) immunostaining with merged image (bottom) in limb muscles from the mouse model of ALS showed that Wnt7a was within the sarcolemma of muscle fibre in the mouse model of ALS. Credit Vahid M. Harandi, Umeå University Usage Restrictions This photo may only be used in contexts related to this news release. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.