在DNA编码序列中一个碱基G被另一个碱基C替代，这种突变为

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SQL Error: select id,body,options from ***_enewstiku where sourceid='24542' and id < 2107875 and id<>'2107875' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24542' and id > 2107875 and id<>'2107875' order by id asc limit 5