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Summary BACKGROUND: Complement component 5a (C5a) might be involved in the formation of wheals in patients with chronic urticaria (CU). We sought to compare the in vitro responsiveness of basophils to C5a in patients with CU and in a control group. METHODS: Basophil surface expression of activation marker CD63 induced by C5a, anti-FcεRI mAb or anti-IgE pAb was measured using flow cytometry in 17 patients...
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