10.22376/ijpbs.2019.10.1.p1-12 Volume 1 Issue 2 2010 (April - June) The influence of the ethanolic extract of the aerial parts of Onosma bracteatum wall on degranulation of rat peritoneal mast cell induced by compound 48/80 and Egg albumin was studied. The inhibitory effect of the extract was significant in immunologically induced degranulation of mast cells.  G. P. Choudhary Flavonoids, Kitotifen, Mast cell degranulation, Onosma bracteatum. -