The orphan G protein-coupled receptor GPR40 is activated by medium and long chain fatty acids. - Briscoe CP; Tadayyon M; Andrews JL; Benson WG; Chambers JK; Eilert MM; Ellis C; Elshourbagy NA; Goetz AS; Minnick DT; Murdock PR; Sauls HR Jr; et al. (The Journal of biological chemistry, 2003)