导致移码突变的原因是DNA上碱基的（    ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='27517' and id < 2271349 and id<>'2271349' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27517' and id > 2271349 and id<>'2271349' order by id asc limit 5