Additional studies revealed the unstable tetranucleotide CCTG repeat expansion in intron 1 of CNBP (Cellular Nucleic Acid-Binding Protein) gene, located on the long arm of chromosome 3 (chr 3q21.3) (OMIM #116955), as the causative mutation for these “Steinert-Like” myotonic dystrophy [31, 32]. The gene discussed is CNBP; the disease is myotonic dystrophy.