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There have been several puzzling issues in the field of sex pheromone olfaction over the past several decades.One of these is the question of why, in nearly every species, are the majority of olfactory receptor neurons (ORNs) tuned to the most abundant pheromone component in a species sex pheromone blend? A related question concerns ORNs co-compartmentalized in the same sensillum: why does the ORN apparently tuned to the most abundant pheromone component in the blend have a larger diameter dendrite than the ORN tuned to the minor component and produce a larger amplitude action potential than the ORN tuned to the minor component?