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. 2001 Jul 2;20(13):3526–3534. doi: 10.1093/emboj/20.13.3526

graphic file with name cde339f6.jpg

Fig. 6. Models for cooperating telomerase active sites. (A) Obligatory coordinated extension and translocation of two telomere 3′ ends (e.g. sister chromatids). (B) Template switching upon translocation during processive elongation of one telomere 3′ end.