Abstract
The prevention of nonhomologous end‐joining (NHEJ) reactions between chromosome ends is crucial for maintaining genome stability. Although this protective function is known to be fulfilled by a core of conserved telomeric proteins that are collectively known as Shelterin, its mechanistic details remain a mystery. In this issue, Sarthy et al (2009) lend fresh insight by developing an ingenious method to dissect the role of hRAP1 in preventing telomeric NHEJ independently of other Shelterin components.
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