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Trisomy 18 syndrome with an unusual karyotype: possible double isochromosome.
  1. L M Larson,
  2. W A Wasdahl,
  3. J H Saumur,
  4. M L Coleman,
  5. S M Jalal


    Chromosome analysis of an infant with characteristic features of trisomy 18 is presented. The chromosome complement contained a modal count of 47 but there was only one No. 18. In addition, there were two metacentric chromosomes of different sizes. The two metacentric chromosomes were identified by G- and C-banding to be possible isochromosomes of the long and short arms of a No. 18 chromosome.

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