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Fig. 1. Olfactory neuron projection in Drosophila and mouse.
(A)In Drosophila, the Notch on-off code (red, Notch off;
green, Notch on) is involved in coupling antennal neuron axonal projections
with their odorant receptor expression. (B) In the mouse, the odorant
receptor code is transformed into gene expression patterns that regulate
axonal fasciculation via neuronal activity (red and green indicate different
adhesion molecules). The X and Y labels next to the cell bodies indicate
odorant receptor types. The diamonds indicate homophilic adhesions.