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Single-strand extensions of the G strand of telomeres are known to be critical for chromosome-end protection and length regulation. Here, we report that in C. elegans, chromosome termini possess 3′ G-strand overhangs as well as 5′ C-strand overhangs. C tails are as abundant as G tails and are generated by a well-regulated process. These two classes of overhangs are bound by two single-stranded DNA...