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. 2008 Apr 24;100(1):317–326. doi: 10.1152/jn.90391.2008

FIG. 3.

FIG. 3.

Parvalbumin distinguishes the first-order and higher-order auditory regions, whereas cytochrome oxidase distinguishes the first-order somatosensory area. A and B: the first-order auditory regions stain intensely for parvalbumin in the ventral portion of the medial geniculate nucleus (MGv) (A) and in the primary auditory area (AI) cell bodies (B). C and D: the higher-order auditory regions are weakly immunoreactive in both the dorsal portion of the medial geniculate nucleus (MGd) (C) and AII (D). E and F: cytochrome oxidase intensely labels the barrel region (E). F: a recovered biocytin-filled neuron in the primary somatosensory area (SI).