染色体制备过程中须加入下列哪种物质以获得大量分裂象细胞

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SQL Error: select id,body,options from ***_enewstiku where sourceid='24545' and id < 2107692 and id<>'2107692' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24545' and id > 2107692 and id<>'2107692' order by id asc limit 5