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Fig. 1. Section of the olfactory epithelium showing BrdU-ir in single and clustered
cells. Positive staining appears as a black precipitate. (A) Typical round
morphology of a BrdU-ir cell in the basal cell layer. (B) Elongated morphology
typical of a BrdU-ir cell in the mid-apical cell layer. (C) An example of a
BrdU-labeled cluster of four cells situated in the basal region of the
epithelium. Labeled cells are black and appear to be in close juxtaposition to
each other. Length bars (10 µm) distinguish the extent of the basal region
in A, B and C. Scale bar in B, 10 µm.