Angelman综合征是由于15q11的下列哪项缺失或下调，从而出现了异常的智力低下表现型

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SQL Error: select id,body,options from ***_enewstiku where sourceid='24530' and id < 2108282 and id<>'2108282' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24530' and id > 2108282 and id<>'2108282' order by id asc limit 5