One disease affecting these structures is X-chromosome linked to mutations in the DKC1 gene and may require bone marrow transplants. 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, are a major risk factor for idiopathic pulmonary fibrosis. Cajal bodies (-5[1])may serve to recruit RNA structures that act on these structures. (-5[2])The Hayflick limit (10[1])is based on the length (10[2])of (10[1])these structures (10[1])that can be extended by TERT. Shortened examples of these structures that lose their shelterin cap can trigger senescence, and these structures consist of repeating TTAGGG (10[1])motifs. For 10 points, what DNA sequences protect the ends of chromosomes? (10[1])■END■ (10[2])