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Retrograde tracer injection into the facial nucleus. A: Thionin-stained section through the facial nucleus. B: Magnified view of the facial nucleus illustrating the medial (M), intermediate (I), dorsal (D), and lateral (L) subnuclei. B`: Adjacent section using fluorescent microscopy to reveal the Fluoro-Gold (FG) injection into the lateral facial nucleus. Note that the FG also diffused into the intermediate subnucleus. Scale bars = 500 µm in A; 250 µm in B,B`.
