Assertion: telomere's length | /r/HasProperty | hahn
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text: As mentioned above, normal human somatic cells express low to undetectable levels of telomerase activity that are insufficient to maintain telomere lengths, whereas more than 90% of human tumor cell populations that have been assayed express high levels of telomerase activity and maintain telomere lengths (Hahn 2005, Shay & Bacchetti 1997).