T-cell receptor excision circles
Encyclopedia
T-cell receptor excision circles (TRECs) are small circles of DNA
DNA
Deoxyribonucleic acid is a nucleic acid that contains the genetic instructions used in the development and functioning of all known living organisms . The DNA segments that carry this genetic information are called genes, but other DNA sequences have structural purposes, or are involved in...

 created in T-cells during their passage through the thymus as they rearrange their TCR genes.

Single joint T-cell receptor excision circles (sjTRECs) are
in the news as a way to test the age of the individual from a blood sample.
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