Fig. 6. Photomicrographs depicting BrdU-ir along the ventromedial aspects of the bulbs of an animal that was injected with BrdU on P21, 24 hr after the naris was reopened, and survived for 30 d. Many more BrdU-containing profiles are visible among periglomerular cells of the GLM of the experimental bulb (A) compared with the contralateral control bulb (B). Graph, Mean percentage differences in numbers of BrdU-containing profiles between experimental and control bulbs. Subjects had a naris closed from P1 to P20, were injected with BrdU on P21 or P50, and survived 30 d after the BrdU injections. GLM, Glomerular layer; GCL, granule cell layer. C, Photomicrograph of a section adjacent to the one shown in B that was processed through immunocytochemistry for BrdU (brown) and calretinin (blue). A double-labeled cell (arrow) is visible along with single-labeled cells that were immunoreactive for either BrdU (filled arrowheads) or calretinin (open arrowhead). A process from the double-labeled cell can be seen extending in the direction of a single-labeled BrdU-ir cell. GLM, Glomerular layer; NL, nerve layer. Scale bar (shown inC): A, B, 40 μm; C, 10 μm.