Enzymatic RNA Molecules and the Structure of Chromosome Ends 
a similar function in human cells and have ob- 
tained some promising initial results. Telomeres 
appear to help organize chromosomes within the 
nucleus, and this organization has been reported 
to be perturbed in cancer cells. Information 
about the human telomere-binding protein and 
its interaction with the nuclear envelope may 
therefore be of medical importance. 
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