细胞后代在形态结构和功能上发生差异的过程称为（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29828' and id < 2420877 and id<>'2420877' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29828' and id > 2420877 and id<>'2420877' order by id asc limit 5