“…In the pharmacological analysis of the mechanism of systemic anaphylaxis of the rat, no uniform conclusion has been reached [9,14,15,21,34,35]. Based on the observations that a) tissue mast cells are disrupted, b) a rise in plasma histamine occurs during anaphylaxis, and c) rats are protected against systemic anaphylaxis by pretreatment with either antihistamine drugs or the chemical histamine liberator, compound 48/80, M ota [21] concluded that histamine plays an important role in rat anaphylaxis.…”