蛋白质可以被（ ）修饰。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25867' and id < 2171451 and id<>'2171451' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25867' and id > 2171451 and id<>'2171451' order by id asc limit 5