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Euchromatic genes
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juxtaposed to heterochromatic sequences following chromosomal3 y; S* o6 C4 o0 g* A' A
rearrangement or transposition 。% V: Q8 `! F. b  @1 W
; U1 F6 \8 e# }$ r& t9 ]+ d* Z
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The two main chromatin states are heterochromatin and' E2 Q5 I3 @7 F$ p' o
euchromatin. Heterochromatin exists in various tightly bound- D% q/ m: o7 ?6 V
conformations. Euchromatin is less condensed and most often8 E  B9 F- {3 V
associated with transcriptional activation. Euchromatic genes
# o6 n6 U' w( f" P, l# Imay be silenced and even exhibit a variegated phenotype when% N4 d. n2 q8 r
juxtaposed to heterochromatic sequences following chromosomal
- X" j; s4 Q' j8 ^  S& I. N% wrearrangement or transposition
: [& n! S8 X$ y# ]& _& Q这是一整段。本文讲染色体包装的