In Nature this week, investigators at Northwestern University, along with their collaborators in Korea, report mutants of the novel Drosophila gene twenty-four, or tyf, which they say "show weak [circadian] behavioral rhythms." The team goes on to suggest that, as "TYF activates reporter expression when tethered to reporter messenger RNA," it may activate translation of the clock protein Period "in pacemaker neurons to sustain robust rhythms, revealing a new and important ro