The<unk>  is due to the release of histamine. Histamine, or 2-(imidazol-4-yl)ethanamine, is a dibasic vasoactive amine that is located in most body tissues but is highly concentrated in the lungs, skin, and gastrointestinal tract. Histamine is a small molecule, stored in granules of mast cells and basophils. Mast cells and basophils are the effector cells involved in the immediate hypersensitivity<unk> . Found in tissues throughout the body, they are particularly associated with blood vessels and nerves, and are in proximity to surfaces that border the external environment.
Triple response of Lewis
Junior blood group system
Indian blood group system
Vel blood group
Augustine blood group system
P1PK blood group system
Rh blood group system
Hh blood group