下列氨基酸中哪些有分支侧链（    ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='27524' and id < 2270963 and id<>'2270963' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27524' and id > 2270963 and id<>'2270963' order by id asc limit 5