真核细胞染色质的基本结构单位是（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29808' and id < 2420663 and id<>'2420663' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29808' and id > 2420663 and id<>'2420663' order by id asc limit 5