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Photomicrographs of TH-immunostained sections through the petrosal ganglion, taken at the level of the glossopharyngeal nerve (arrow), from (A) wild-type, (B)bdnf+/+nt4−/−, (C)bdnf−/−nt4+/+, (D)bdnf−/−nt4−/−, and (E) trkb−/− mice. Compared with the wild-type, the number of TH+ profiles was reduced significantly inbdnf−/−nt4+/+,bdnf−/−nt4−/−, and trkb−/− mice but was unchanged inbdnf+/+nt4−/−animals. Scale bar, 100 μm.
