Functional evolution of a multigene family: orthologous and paralogous pheromone receptor genes in the turnip moth, Agrotis segetum.
Lepidopteran pheromone receptors (PRs), for which orthologies are evident among closely related species, provide an intriguing example of gene family evolution in terms of how new functions may arise.However, only a limited number of PRs have been functionally characterized so far and thus evolutionary scenarios suffer from elements of speculation.