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Photomicrographs (light microscopy) of aromatase expression in sections (1 μm) of the zebra finch brain. While immunoreactivity is seen in the cytoplasm but not the nucleus (n) of several somata in the (a) HPOA and (b) NCM, it is also observed in multiple puncta (arrows) distributed throughout the parenchyma. Magnification bars=20 μm.
