All repeat expansions existed in DMPK, a gene associated with myotonic dystrophy 1 in which “normal alleles” consist of 5–34 CTG repeats within the 3′ UTR, typically asymptomatic “premutation alleles” between 35 and 49, and fully penetrant alleles over 50 CTG repeats (Prior, 2009). This evidence concerns the gene DMPK and myotonic dystrophy.