Arthur J. Lustig is in the Department of Biochemistry, Tulane University Health Sciences Center, 1430 Tulane Avenue, New Orleans, Louisiana 70112, USA. email: alustig@mailhost.tcs.tulane.edu
Telomeres, the protein−DNA complexes at the ends of eukaryotic chromosomes, are essential for chromosomal stability. Recent findings suggest that a single regulator in yeast, Cdc13, nucleates specific subcomplexes that regulate specific telomeric functions.