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Anaphylaxis during general anaesthesia is a significant clinical challenge for anaesthesiologists. Approximately 50% of perioperative anaphylaxis cases lack the presence of specific IgE antibodies. Mas-related G-protein coupled receptor X2 (MRGPRX2) in humans and its mouse orthologue Mas-related G-protein coupled receptor B2 (Mrgprb2) are crucial receptors in non-IgE-dependent histamine release. Anaesthetics such as rocuronium and atracurium cause perioperative anaphylaxis by activating histamine release via the Mrgprb2 pathway. We hypot