( )参与了嘌呤核苷酸的从头合成过程，并提供了 IMP上嘌呤环的7位N。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25866' and id < 2171401 and id<>'2171401' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25866' and id > 2171401 and id<>'2171401' order by id asc limit 5