| A three-generation family affected with myotonic dystrophy. The degree of severity increases in each generation. The grandmother (right) is only slightly affected, but the mother (left) has a characteristic narrow face and somewhat limited facial expression. The baby is more severely affected and has the facial features of children with neonatal-onset myotonic dystrophy, including an open, triangular-shaped mouth. The infant has more than 1000 copies of the trinucleotide repeat, whereas the mother and grandmother each have approximately 100 repeats. |
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