生物体调节基因表达最根本的目的是（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29827' and id < 2420846 and id<>'2420846' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29827' and id > 2420846 and id<>'2420846' order by id asc limit 5