What are telomeres made of?

Telomeres are made of repetitive DNA sequences, specifically short repeats of nucleotides (in humans, the repeat sequence is TTAGGG). These repetitive sequences are not coding for proteins but serve a protective function at the ends of chromosomes. Telomeres also contain associated proteins that help stabilize the telomeric region and facilitate the function of telomerase, the enzyme responsible for adding DNA repeats to the telomeres. The telomere structure ensures that important genetic information in the coding regions of chromosomes is not lost during DNA replication.