3.1. The Affinity Purification of the Pex11-α1(VI) Antibody Generates a Highly Specific Tool to Study the Pathomechanism of the UCMD-Causing COL6A1 (c.930 + 189C > T) Intron Mutation. The gene discussed is COL6A1; the disease is Congenital muscular dystrophy, Ullrich type.