Telomere lengths in different rad1 mutants. Cells were grown for ∼100 generations, and DNA was analyzed as described in the legend to Figure 1. Lane 1, 972h−; lane 2, h− ura4-D18 leu1-32 his3; lane 3, KLP20 (rad1-S1); lane 4, KLP23 (rad1-S2); lane 5, GK21 (rad1-S3); lane 6, GK22 (rad1-S4); lane 7, GK23 (rad1-S5); lane 8, GK24 (rad1-S6); lane 9, PS56 (rad1-S56); lane 10, h+ ura4-D18 leu1-32 his3; lane 11, PS36 (rad1::ura4+); lane 12, PS32r (rad1::ura4+); lane 13, GK20 (rad1::ura4+); lane 14, h+ ura4-D18 leu1-32 his3.