COL6A1 and Ullrich congenital muscular dystrophy: In fact, in our cohort, the families with c.877G>A in COL6A1, c.856-2A>G in COL6A2, or c.943G>A in COL6A2 showed a wide range of phenotypes from milder BM to severer UCMD, while conversely the variation in phenotypes of families with c.956A>G or c.1022G>A in COL6A1 was quite narrow and those families showed BM or intermediate phenotypes.