蛋白质的球形结构特征属于（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29807' and id < 2419195 and id<>'2419195' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29807' and id > 2419195 and id<>'2419195' order by id asc limit 5