镰状贫血患者Hb的p链上的异常属于基因何种 突变（    ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='27517' and id < 2271344 and id<>'2271344' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27517' and id > 2271344 and id<>'2271344' order by id asc limit 5