对于代谢途径中某步反应的调节，最慢的方式是（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25860' and id < 2171194 and id<>'2171194' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25860' and id > 2171194 and id<>'2171194' order by id asc limit 5