白喉毒素剧烈毒性是因为它可共价修饰哪种因子（    ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='27516' and id < 2271434 and id<>'2271434' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27516' and id > 2271434 and id<>'2271434' order by id asc limit 5