Figure 2.

RA cells in either sex express trkB but not BDNF mRNA. Shown are dark-field photomicrographs of adjacent sections obtained from the archistriatum of P35 zebra finches. The nucleus is defined by its expression of AR mRNA (A and B). In situ hybridizations for BDNF (C and D) and trkB mRNA (E and F) are shown on adjacent sections for P35 male (A, C, and E) and female (B, D, and F) zebra finches. RA cells do not express BDNF mRNA (C and D) in either sex. However, the BDNF mRNA expression could be observed in the surroundings of the RA (C and D). Expression of trkB mRNA was detectable throughout the archistriatum including the RA (E and F). (Bar = 50 μm.)