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Ratio nucleus volume/telencephalon volume (A), cell density (B) and cell number (C) of song control nuclei HVC and RA. D: mRNA expression levels (fractional area covered by silver grains) of AR, ERĪ±, SNAP-25, SPO and STX1B in HVC; (***p<0.001, **p<0.01, *p<0.05).
