下列物质中属于第二信使的是

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30802' and id < 2480755 and id<>'2480755' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30802' and id > 2480755 and id<>'2480755' order by id asc limit 5