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Trisomy 9p syndrome was first described by Rethore, et al in 1970 and about 150 cases have been reported. Trisomy 9p has been reported as either partial or complete. The term "duplication 9p syndrome" instead of "trisomy 9p syndrome" is used since most of the reported patients had only partial duplication rather than the whole arm duplication of 9p. Duplication... |