Olfactory receptors (ORs) are key to how animals perceive their surroundings, guiding behaviors like foraging, mating, and avoiding danger. In chordates, the genes encoding these receptors are ...

Life began on earth more than 3.5 billion years ago, but the history of humans and other vertebrates accounts for only a fraction of this timescale. Chordates (a group that includes vertebrates) and ...