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In eukaryotes, mutations in a number of genes that affect DNA damage checkpoints or DNA replication also affect telomere length [Curr. Opin. Cell Biol. 13 (2001) 281]. Saccharomyces cerevisae strains with mutations in the TEL1 gene (encoding an ATM-like protein kinase) have very short telomeres, as do strains with mutations in XRS2, RAD50, or MRE11 (encoding members of a trimeric complex). Xrs2p and...