Granule and mitral cell densities are unchanged following early olfactory preference training.

Early olfactory preference training causes both an increased number of juxtaglomerular cells and an increased number of such cells expressing Fos protein. In contrast, there are fewer cells expressing Fos protein in the granule cell layer after training. Here, we report no change in the number or size of granule and mitral cells as a consequence of these early olfactory experiences.