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Enkephalin immunoreactivity defined variation in song nuclei lMAN and auditory nuclei NIf volumes. A) Mean (+/− SEM) total MAN volumes; B) Mean (+/− SEM) lMAN volume; C) Mean (+/− SEM) mMAN volumes; D) Mean (+/− SEM) NIf volume. Significance was determined at * P < 0.05; ** P < 0.01; *** P < 0.005; **** P < 0.001 and asterisks indicate significant differences.
