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The two main chromatin states are heterochromatin and$ j6 i! o( P) ~ w( [& r
euchromatin. Heterochromatin exists in various tightly bound
/ W& ?% N0 H; `conformations. Euchromatin is less condensed and most often
1 j' g! D1 j' h, Eassociated with transcriptional activation. Euchromatic genes
8 `% x7 f7 J* Cmay be silenced and even exhibit a variegated phenotype when
s/ b+ f8 i8 D6 m7 x- o) d- E5 sjuxtaposed to heterochromatic sequences following chromosomal
. K2 R$ \, V8 O9 J5 I1 Erearrangement or transposition
* Z9 B3 n- u3 [, f" t i4 |这是一整段。本文讲染色体包装的 |
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