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0 n+ |/ e$ t5 F+ j/ F# aThe two main chromatin states are heterochromatin and
) Q4 H& C8 ` S3 u( teuchromatin. Heterochromatin exists in various tightly bound# l/ N: ~' Z% h6 s: y
conformations. Euchromatin is less condensed and most often9 L% W6 n6 T& L7 t, {
associated with transcriptional activation. Euchromatic genes
; [- C6 T& V0 @% Z8 r# e/ ymay be silenced and even exhibit a variegated phenotype when9 i3 n( s8 p& I, ~
juxtaposed to heterochromatic sequences following chromosomal
: q+ h, S* g) L! o$ N1 }rearrangement or transposition
0 r$ X y( z+ M4 p这是一整段。本文讲染色体包装的 |
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