Fig. 2.

The glomerular layer of the rat olfactory bulb is organized into domains containing clusters of glomeruli that respond best to odorants sharing molecular features or overall molecular properties as shown. The diagram is a summary of our results using the 2DG technique [3]. The lateral aspect of the olfactory bulb is shown. A similar organization is present on the medial surface of the bulb. Arrows indicate chemotopic progressions within three domains, where odorants of increasing molecular length activate progressively ventral glomeruli. This figure is modified from [3]