COL6A1 and Ullrich congenital muscular dystrophy: Taken together, these results demonstrate that UCMD and BM melanocytes display the same PTP-dependent latent mitochondrial dysfunction previously identified in primary muscle-derived cell cultures from Col6a1−/− mice (Irwin et al., 2003), UCMD and BM patients (Angelin et al., 2007), and zebrafish with ColVI myopathy (Telfer et al., 2010; Zulian et al., 2014).