<i>Drosophila</i> RSK: A Pivotal Regulator of Circadian Plasticity at the Neuronal and Behavioral Level

mutant flies are rhythmic. Their free-running rhythms show even a significantly higher power than those of the wild-type controls. This robustness is at the expense of flexibility to adapt their activity to variations in light conditions. Together with the known role of RSK in olfactory learning and memory processes our results suggest that RSK is required to maintain experience dependent plasticity.