The occurrence of a lipid-soluble smooth-muscle stimulating principle ('SRS') in anaphylactic reaction.
D000707:Anaphylaxis; D006967:Hypersensitivity; D007154:Immune System Diseases; D008055:Lipids; D009130:Muscle, Smooth; D009132:Muscles / Q000502:physiology*
D008055:Lipids
ALLERGY/experimental; MUSCLES/physiology