In the article “Selective role of RGS9-2 in Regulating Retrograde Synaptic Signaling of Indirect Pathway Medium Spiny Neurons in Dorsal Striatum” by Chenghui Song, Garret R. Anderson, Laurie P. Sutton, Maria Dao, and Kirill A. Martemyanov, which appeared on pages 7120–7131 of the August 8, 2018 issue, neuronal populations schematically drawn in Figure 3A were mislabeled. A corrected version of the figure is presented here. This correction concerns display issues in the scheme only and does not affect the labeling of the data, results, or conclusions from the study.