In a recent experiment, researchers tested hundreds of receptor gene types found in human and mouse noses.
By inundating the receptors with odors, researchers were able to figure out which receptors respond to which odor molecules and translate the smells into brain signals.
Unlocking this interface would show how the brain recognizes and reacts to different smells.
— Read more at Scent Secrets Unlocked, Artificial Noses Ahead? at the National Geographic.