One disease affecting these structures is X-chromosome linked to mutations in the DKC1 gene and may require bone marrow transplants. (-5[1])Dyskerin helps to stabilize a catalytic complex that acts on this structure. (10[1])Deficiencies in maintaining these structures, which are measured by the Q-FISH technique, (10[3]-5[1])are (10[1])a major (10[1])risk factor (10[1])for idiopathic pulmonary fibrosis. Cajal bodies (-5[1])may serve (-5[1])to recruit (-5[1])RNA structures (-5[1])that act on these structures. (-5[3])The (-5[1])Hayflick limit (10[6])is (10[1])based (10[2])on (10[1])the (10[2])length (10[8])of (10[1])these (10[1])structures (10[14])that can be (10[1])extended (10[1])by TERT. (10[2])Shortened (10[1])examples of these structures (10[1])that lose their shelterin (10[1])cap can trigger senescence, (10[3]-5[1])and these structures (-5[2])consist of repeating (10[2]-5[1])TTAGGG (10[5]-5[1])motifs. (10[2]-5[1])For 10 points, what DNA sequences (10[1])protect the (10[1])ends (10[2])of chromosomes? (10[2])■END■ (10[19]0[6])