Fig. 2. Olfactory receptor neurons in amos mutants. Confocal projection images of late pupal antennae stained to detect sensory neurons. (A) Wild type. Clusters of cell bodies and their dendrites can be seen. (B) amos³ mutant showing far fewer clusters. (C,D) Higher magnification views. Although most ORNs are clustered, as seen by the multiple dendrites (*) (representing sensilla coeloconica), some sensilla appear to be mono-innervated (arrows) and may represent the bristles. (E) Wild-type confocal section showing the three olfactory nerve bundles. (F) Confocal section of amos mutant, with the three bundles labelled (a small section has been pasted in from another confocal plane to show clearly the second bundle).

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