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Reference.org
Position-effect variegation
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<p>Position-effect variegation (PEV) is a <a href="/facts/Variegation_(histology)/TBy1gdXu">variegation</a> caused by the silencing of a <a href="/facts/Gene/e1swwPY6">gene</a> in some cells through its abnormal juxtaposition with <a href="/facts/Heterochromatin/frJ8HL41">heterochromatin</a> via rearrangement or <a href="/facts/Transposable_element/WbVMhuWR">transposition</a>. It is also associated with changes in <a href="/facts/Chromatin/ha0TJheJ">chromatin conformation</a>. </p>