Cover photograph (Copyright © 2006, American Society for Microbiology. All Rights Reserved.): Wild-type and stn1-M1 mutant colonies of the yeast Kluyveromyces lactis. The mutant, identified in a screen for irregular colonies, maintains long and highly heterogeneous telomeres using recombination. The colonies are shown overlaid on a background of a rare Mexican obsidian of irregular composition. (See related article in September 2005, vol. 25: issue 18, p. 8064.)