They form a functional complex with another protein, the so - called
olfactory receptor co-receptor, which enables insects to smell the tiniest amounts of odor molecules in their environment very rapidly.
Christine Mißbach, first author of the study, analyzed the active genes in the insect antennae where the
olfactory receptors are located and describes her discovery this way: «Astonishingly, the firebrat, which is more closely related to flying insects, employs several
co-receptors, while the odorant receptors themselves are absen
receptors, while the odorant
receptors themselves are absent.»