Pheromones are chemical signals that allow animals of the same species to communicate. For this communication to be truly species-specific, the signals emitted and the mechanisms for detecting them must diversify rapidly. In the CReA team, we study the evolution of membrane receptors responsible for the detection of pheromones by insect antennae. Using various molecular biology and bioinformatics methods, we compare in closely related species i) the number of genes encoding these receptors, ii) their expression levels in the antennae and iii) their detection spectra, in order to retrace their evolutionary history.