Effects of Beta-Carboline Alkaloids of Peganum Harmala on Induced Rat Ileum Contractions, Shatarat, Amjad T., Abuhamdah Sawsan, Alefishat Eman, Al-Essa Mohamed K., R Rima Altaweel, Mohammed Faisal, Badran Darwish, and Jafar Hanan , Pharmacognosy Journal, March 2020, Volume 12, Issue 2, p.260-265, (2020)