下列哪种细胞骨架成分并不存在于所有真核细胞中？

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30528' and id < 2465243 and id<>'2465243' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30528' and id > 2465243 and id<>'2465243' order by id asc limit 5