Exendin-4 agonist and exendin (9–39) amide antagonist of the GLP-1(7–36) amide effects in liver and muscle. - Alcantara,AI.; Morales,M.; Delgado,E.; Lopez Delgado,MI.; Clemente,F.; Luque,MA.; Malaisse,WJ.; Valverde,I.; Villanueva Penacarrillo,ML. (Arch Biochem Biophys, 1997)