第二信使cAMP的作用是激活（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29831' and id < 2422491 and id<>'2422491' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29831' and id > 2422491 and id<>'2422491' order by id asc limit 5