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Cover legend: Striatal neurons, taken from BAC D2-eGFP transgenic mice in order to identify those cells expressing the dopamine 1 or 2 receptor (D1 or D2), were filled with biocytin and reconstructed to examine dendritic branching patterns and total dendritic arbor. The red, pink, yellow, and orange neurons are D1 medium spiny neurons, which have a larger dendritic arbor as compared to D2 medium spiny neurons (blue, purple, teal, and light blue). These anatomical differences contribute to differences in excitability seen electrophysiologically. A GABAergic interneuron (white) is included for comparison. For more information, see the article by Gertler et al. in this issue (pages 10814–10824).