Abstract
Mentally retarded and monozygous twin sisters, with little physical abnormality, are described. Each twin carried a small ring chromosome, identified as a number 22.
MeSH terms
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Child, Preschool
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Chromosome Aberrations*
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Chromosomes, Human, 21-22 and Y*
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Diseases in Twins*
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Female
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Humans
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Hyperkinesis / genetics
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Intellectual Disability / genetics*
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Karyotyping