For 10 points, name this biological substance released in the presence of a foreign antigen, a causative agent of allergic reactions.
ECL cells located in the mammalian gastric fundus release this chemical, which in turn spurs an increase of acid secretion in the stomach. Found in the venom of bees and wasps as well as stinging nettles, it was isolated from the ergot plant fungus by George Barger and Henry Dale. Basophils harbor many granules containing this substance, and its activity can contribute to anaphylaxis. For 10 points, name this biological substance released in the presence of a foreign antigen, a causative agent of allergic reactions.
ECL cells located in the mammalian gastric fundus release this chemical, which in turn spurs an increase of acid secretion in the stomach.
{Histamine}