乳糖操纵子是（ ）中的基因表达调控系统。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29827' and id < 2420805 and id<>'2420805' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29827' and id > 2420805 and id<>'2420805' order by id asc limit 5