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7 k* ~+ r+ `: |( g# f+ K
# w) ~7 }4 B* V7 T) DThe two main chromatin states are heterochromatin and
9 a; r) i! t7 D* Q, [/ @0 p8 @( I, Weuchromatin. Heterochromatin exists in various tightly bound
, {5 n I8 E( qconformations. Euchromatin is less condensed and most often
' l" o E+ y3 ?2 J9 k# Iassociated with transcriptional activation. Euchromatic genes0 s0 r+ S9 P. g5 i' c
may be silenced and even exhibit a variegated phenotype when8 j" z4 [9 j. C* ]$ _" z
juxtaposed to heterochromatic sequences following chromosomal, C5 f2 W _* B+ L1 N1 Y9 g
rearrangement or transposition* d/ o1 H3 r, W; H. ~0 {
这是一整段。本文讲染色体包装的 |
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