Key points from article :
Newly discovered a protein, named TZAP, binds the ends of chromosomes.
TZAP controls a process called telomere trimming, ensuring that telomeres do not become too long.
Lengthening telomeres could slow aging but unnaturally long telomeres are a risk factor in developing cancer.
This protein sets the upper limit of telomere length.
The study was published in the Science journal.
