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Partial trisomy 20 (20q13) and partial trisomy 21 (21pter leads to 21q21.3).
  1. O Sanchéz,
  2. P Mamunes,
  3. J J Yunis


    A patient with a double partial trisomy 20 and 21 with mild mental retardation and multiple congenital anomalies is presented. Despite trisomy for a substantial portion of chromosome 21, the patient showed only minor stigmata compatible with Down syndrome.

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