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什么叫表观遗传学呢？表观遗传是指DNA序列不发生变化，但基因表达却发生了可遗传的改变。这样的改变是细胞内除了遗传信息以外的其他可遗传物质发生的改变，且这种改变在发育和细胞增殖过程中能稳定传递。这是我从百度百科上抄来的。要是当年发现DNA的那帮人听说还有这么一回事儿，他们估计能哭晕在厕所里。难道还有什么DNA以外的遗传物质吗？这事儿可新鲜。其实一点儿也不新鲜。你想啊，人体的细胞里面，遗传物质都一样啊。一个人也是从受精卵慢慢分裂生长出来的。为何有的细胞长成了心脏细胞，有的长成了脑细胞呢？谁来控制这个过程。必然是有些额外的信息要记录的，这事儿大约70年代科学家们就已经知道了……
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