Scyliorhinin II is a neurokinin-3 selective tachykinin receptor, with a Ki of 2.5 nM for neurokinin-3 (NK-3) receptor in rat cerebral cortex. Scyliorhinin II has little effect on NK-1 and NK-2 receptors, with Ki (NK-1 receptor)/Ki (NK-3 receptor) and Ki (NK-2 receptor)/Ki (NK-3 receptor) of 176 and 200.