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! k: m; t% o$ ~7 ~& }The two main chromatin states are heterochromatin and* ]" [* ]$ W/ Y; k m' j) o3 d
euchromatin. Heterochromatin exists in various tightly bound/ }4 E* n) u6 W) ]2 L l4 g
conformations. Euchromatin is less condensed and most often
/ o8 T* ]) G" f4 _: sassociated with transcriptional activation. Euchromatic genes, ?1 [7 X8 O3 k
may be silenced and even exhibit a variegated phenotype when
$ h7 z2 c( |% ?: Z. m: sjuxtaposed to heterochromatic sequences following chromosomal% _% \- X# ~9 O q) R$ Y# ?
rearrangement or transposition
" [: t/ @ }! e: l5 y% r这是一整段。本文讲染色体包装的 |
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