In the article “NCS-Rapgef2, the Protein Product of the Neuronal Rapgef2 Gene, Is a Specific Activator of D1 Dopamine Receptor-Dependent ERK Phosphorylation in Mouse Brain,” by Sunny Zhihong Jiang, Wenqin Xu, Andrew C. Emery, Charles R. Gerfen, Maribeth V. Eiden, and Lee E. Eiden, which appeared as e0248-17.2017 in the September/October 2017 issue, it was discovered that Figure 4D,F inadvertently used the same image (Fig. 4F is correct; Fig. 4D is a duplication of Fig. 4F). This occurred accidentally, in part because both panels represent a “no effect” control. Replacing this panel does not change anything substantive in the figure, or in the manuscript. The corrected figure is presented here. Figure 4 has been corrected in the online PDF version.