( )不仅参与了细胞嘌呤核苷酸的合成，而且还参与了嘧啶核苷酸的合成。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25860' and id < 2171190 and id<>'2171190' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25860' and id > 2171190 and id<>'2171190' order by id asc limit 5