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THE GENES INVOLVED IN PRADER-WILLI AND ANGELMAN SYNDROMES
In 1981, the Prader-Willi syndrome was found to be associated with a very small deletion in the long arm of human chromosome 15, between bands q11 and q13 (Ledbetter et al., 1981). However, in 1987, an identical deletion was reported in a number of patients who suffered from a very different disease, Angelman syndrome. These syndromes give quite distinct phenotypes (Figure 1). Prader-Willi syndrome is characterized by developmental delay ...
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