Telemeres are genetic book-ends that cap the ends of coding sequences within chromosomes. Their length is chipped away every time DNA replicates. Telemeric length is an indicator of an animals age but can also be suggestive of stress or environmental conditions.
An interesting review article has been published that examines telomeric length as potential verification for fish authenticity descriptions such as organic vs conventional rearing or wild-caught vs aquaculture.
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