In the article “Dopamine D4 Receptors Regulate AMPA Receptor Trafficking and Glutamatergic Transmission in GABAergic Interneurons of Prefrontal Cortex” by Eunice Y. Yuen and Zhen Yan, which appeared on pages 550–562 of the January 14, 2009 issue, there was an error in Figure 2. In the top left panels, which show immunocytochemical images of surface GluR1 in an untreated prefrontal interneuron (control surface GluR1), the two enlargements accidentally included overlapping sections from a single dendrite. A corrected version is presented here. The authors regret this error. It does not affect any conclusions or interpretations in the article.