Animals, from molecular changes observed over time between young people and older, researchers have identified a shorter sequences at the ends of chromosomes, called telomeres, and a change in gene expression, such as certain immune system genes.
Wanyama, kutokana na mabadiliko ya Masi aliona juu ya muda wa kati ya vijana na wazee, watafiti na kutambuliwa Utaratibu mfupi katika ncha ya chromosomes, inayoitwa telomeres, na mabadiliko katika upatikanaji wa jeni, kama vile baadhi ya mfumo wa kinga ya jeni. ushiriki wa taratibu hizi mbili Masi itaonekana hifadhi katika viumbe wote alisoma mifano (chachu, Drosophila, panya, na mtu).