遗传密码中可编码20种氨基酸的密码子共有（    ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='27516' and id < 2271400 and id<>'2271400' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27516' and id > 2271400 and id<>'2271400' order by id asc limit 5