Receptor for the pain modulatory neuropeptides FF and AF is an orphan G protein-coupled receptor. - Elshourbagy NA; Ames RS; Fitzgerald LR; Foley JJ; Chambers JK; Szekeres PG; Evans NA; Schmidt DB; Buckley PT; Dytko GM; Murdock PR; Milligan G; et al. (The Journal of biological chemistry, 2000)