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UTA FRANCKE, MD
Department of Pediatrics University of California at San Diego School of Medicine La Jolla, CA 92093

Am J Dis Child. 1977;131(12):1406.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

In Reply.—I would like to point out that phenotypic differences between unrelated individuals with apparently identical chromosomal duplications can be due to three mechanisms: (1) differences in the extent of the duplicated segment; (2) differences in the associated deletions in cases of inherited reciprocal translocations; and (3) different genetic backgrounds.

Our patients with duplication of chromosome 2 (region 2p232pter) reported in the JOURNAL presumably also have a minute deletion from the 7q terminus, as we have described and discussed in the article. This deletion is hypothetical since it is not evident on banded metaphase chromosomes, and meiotic studies to prove the reciprocal nature of the translocation have not been possible. Therefore, we did not include the deletion in the title. We believe that the designation of "duplication/deficiency syndrome" should be reserved for those cases in which the deficiency is cytologically evident, such as in unbalanced off-spring of carriers of . . . [Full Text PDF of this Article]

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