GJA5 and Duchenne muscular dystrophy: Since Purkinje fiber degeneration has been observed in human and canine DMD (Urasawa et al., 2008; Echigoya et al., 2017; Nomura and Hizawa, 1982), we used the Cx40-GFP mouse line to study the morphology and histology of Purkinje fibers in mdx::Cx40-GFP mice.