Figure 2.

Distribution of genes in four major song nuclei. Results of in situ hybridization for 15 selected genes in four major telencephalic song nuclei: Area X, the lateral magnocellular nucleus of the anterior nidopallium (LMAN), HVC, and the robust nucleus of the arcopallium (RA), showing a complex distribution of expression across the song system. The approximate area of each nucleus is illustrated in the top left panel displaying results for each nucleus. Left and right hemispheres display different genes, all labelled with numbers as follows: 1-schematic; 2-NTS; 3-ADCYAP1; 4-VIP; 5-SCG1; 6-OREX; 7-MST; 8-POMC; 9-NPY; 10-CPN2; 11-CBLN1; 12-TAC1; 13-NPVF; 14-PENK; 15-PEBP1; 16-SST.