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Monozygotic Twins with Ring Chromosome 22
  1. R. H. Lindenbaum,
  2. M. Bobrow,
  3. L. Barber
  1. MRC Population Genetics Unit, Old Road, Headington, Oxford, and The Park Hospital for Children, Old Road, Headington, Oxford


    Mentally retarded and monozygous twin sisters, with little physical abnormality, are described. Each twin carried a small ring chromosome, identified as a number 22.

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