下列选项中，既能编码甲硫氨酸，又是启动密码子的是（

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30918' and id < 2488161 and id<>'2488161' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30918' and id > 2488161 and id<>'2488161' order by id asc limit 5