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(a–r) Representative in situ hybridization photomicrographs of parasagittal sections of adult male zebra finches at the level of RA (∼2.2 to 2.4 mm from the midline). Arrowheads approximate the cytoarchitectonic borders of nucleus RA; dotted line roughly approximates the lamina between the arcopallium and nidopallium. Abbreviations: arco., arcopallium; nido., nidopallium
