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Although Prader-Willi syndrome was first described 35 years ago, it was following detection of an interstitial chromosome 15q deletion in some affected patients ten years ago that it became a major focus of multidisciplinary scientific interest. This interest was compounded by the later determination that some patients with a clinically distinct disorder, Angelman syndrome, apparently also had the same chromosome 15q deletion. Subsequently, molecular genetic studies showed that some cytogenetically normal patients with both disorders have uniparental disomy, maternal in Prader-Willi syndrome...