obsolete_telomere length true Helen Parkinson http://purl.obolibrary.org/obo/OBA_0003784 3.74.0 Project to replace EFO measurement branch with enriched OBA branch. Please use: OBA:0003784 A measurement of telomere length measures the number of TTAGGG repeats at the end of the chromosome. As cell division proceeds telomeres shorten, telomere length is measure of cellular aging. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3370421/