Plays an olfactory role that is not restricted to pheromone sensitivity. Localizes to both male and female antennae but not the leg, wing, gut, head, or thoracic ganglia. Detected throughout the sensory epithelium, associating with both sex-pheromone sensilla and plant-volatile sensilla. Differentially expressed both among different sensilla and different neurons within a given sensillum. Expression coincides with that of several other olfactory-specific proteins that are involved in odor detection. Detected at very low levels 48 hours before adult emergence. Levels dramatically increase around 24 hours prior to emergence and are subsequently maintained at a similar level in both newly emerged animals as well as in animals 24 hours postemergence. Belongs to the CD36 family.